Fallout 4 Bugs

Infinite Caps
When trading with a merchant the player buys a large quantity of one type of ammo (ex .308, .45, etc). The players does not complete the trade but instead goes to the to-be purchased ammo in their inventory and gives back one. The player then gives back the rest. Now the player has a single unit of that "shadow" ammo left in their inventory that they can sell back to the trader. After repeatedly selling back that "shadow" ammo for dozens of time, the player can then buy back all those "shadow" ammo sold to trader and in effect double the "shadow" caps you earned. This buy back action makes the whole rip-off process much quicker. The caps the trader owes you can then be traded for the rest of the NPC's inventory.

This can also work to your advantage when buying other goods from a vendor. after completing the first steps, instead of taking all of the vendors caps, the player can select all of the vendor's inventory and then pay the difference with the bullets in the glitch. In this case, it is better to use ammo with a higher value so the purchase process goes quicker.

Note
after selling some ammo back to the trader (about 100) go over to the traders inventory and attempt to buy all of the ammo back and it will keep increasing the caps much faster than selling a few bullets at a time

Works better if they have over 200 of that type of ammo. (Doubt it, it works when trader has 7 or more of ammo)

Ammo is sold back to the trader for the value of ammo the trader is selling it for.

Slowly, over time, if the player continues to trade back the ammo, the number of caps being traded will moved to the left of the screen until it's gone.

If the glitch doesn't work for a trader, you can try trading ammo with the trader and try again or use fast travel then try the same trader. In some case this will make the glitch work again.

The type of "shadow" ammo used will be completely traded to the trader thus leaving the player none in inventory. You may deposit the ammo in a nearby container to preserve the ammo you need for guns before trading.

Confirmed to work

 * Some settlement store workers
 * Trashcan Carla
 * Arturo Rodriguez
 * Doctor Sun
 * Percy
 * Moe Cronin
 * Proctor Teagan
 * Becky Fallon
 * Solomon
 * Cricket

Does not work

 * Polly (she usually does not have enough ammo for the glitch to work)

Weapon Mods

 * While adding a muzzle for a gun it somehow gave me the silencer which I haven't unlocked. When I closed and re-opened the menu it brought back the muzzle I actually applied.

Crashing, freezing and other hardware- or software-related issues

 * Game random crashing/freeze often enough to make game play frustrating. Using Beta version seems to have resolved this. See instructions here http://gearnuke.com/fallout-4-download-1-1-30-beta-update-fix-pc-crashes-related-xaudio-drivers/#
 * When talking under water the game crashes.
 * When using multiple monitors with Nvidia SLI, the lower half of the view will have a dark band.
 * Custom resolutions for multiple monitor setups require editing Falloutpref.ini file.
 * Disabling "Windowed" mode in settings with NVidia SLI enabled and using multiple monitors will cause crash on loading screen.
 * Using the console command "RefreshShaders" (RS) reliably causes the game to crash

Menu-, HUD-, inventory-, and radio-related bugs

 * Settlement UI for food resources can glitch out displaying duplicate food icons for plantable food and some plantable food icons may disappear but is still selectable.
 * Occasionally the pip-boy texture will fail to load, rendering the in-game menu invisible, but tooltips and keyboard controls continue to work. This can be fixed by reloading from a quicksave.
 * In first-person view the players weapon may disappear from the screen, even though the weapon isn't holstered. Holstering/unholstering doesn't fix this but switching to third-person and back does.

Physics engine glitches
When talking to a companion in a moving elevator it is possible for player character to fall through the floor and die.

The dog companion of the Sole Survivor is able to push any non-solid object out of the way when dashing to follow its master, including cars, which cannot be moved by the player even when wearing power armor.

Graphics glitches
(current working fix http://www.nexusmods.com/fallout4/mods/143/?)
 * When using the "TCL" Console command in Diamond City, all characters nearby seem to have disappearing eyes.
 * When using unsupported resolutions, such as a 5:4 monitor with 1280x1024 resolution, the lockpicking interface will be invisible.

Effect bugs

 * Targeting Hud mod and Berry Mentats that have the effect to highlight creatures may turn some NPCs, such as Paladin Brandis and the robots at General Atomics Galleria, hostile.
 * The shader effect associated with cloaking can become permanently stuck in active mode, leaving everything with a green tint. (This cannot be fixed with the ResetShaders command, because ResetShaders crashes the game)

Non-player character-specific bugs

 * On PC latest patch, equipping Settlement NPC's with armor then equipping them with the exact same armor that they are already wearing will cause an instant crash to desktop.
 * Companions may encounter issues where they will follow, but not run or fast travel. If they are too far from the player when entering a door, they will not follow through the door. The player can initiate speech but will not be able to enter companions inventory.
 * Arturo may never man his stall in Diamond City, remaining in his house and sleeping often.
 * NPC's will sometimes walk away from the player mid conversation even mid sentence. this will cause the conversation to end.
 * Companions may get a recurring sound bug, sounding like a turret. PC reported to happen after fast traveling to Hangman's Alley. Example: https://www.youtube.com/watch?v=GBAjdsh3b34

Quest-specific bugs
Please place quest specific bugs on their respective pages. (Fallout 4 quests)
 * Spoiler Alert*

Shaun requests you to bring him a random piece of junk because he would like to build something. If you have sided with The Institute, Shaun will not take the item after asking.

Location-specific bugs
Please place location specific bugs on their respective page (Fallout 4 locations)

Gameplay bugs

 * High FPS (110<) can cause character to become un-movable requiring a save reload after exiting a terminal.
 * Might be caused by exiting a terminal quickly.
 * When subtitles are on, conversations can become 'stuck' on screen with part of the conversation subtitle remaining while the conversation continues. Text is removed from screen when conversation is complete.
 * Sometimes text options do not show up in dialogue and NPC comments that the player character has not responded. A response can be selected by pressing the correct button but the text doesn't appear.
 * Saving the game near a mine, stepping on that mine causing an explosion and then loading the saved game the mine will disappear.
 * If player character changes their name inside Vault 111 before taking the lift to the surface, the player character can not walk off platform or enter Pip-boy. Looking, jumping, and shooting functions still work.
 * Unable to draw weapon, use grenades, or pull up VATS after fast traveling.Fixed by zooming out into 3rd person view then back into 1st person view.
 * When Leaving Sanctuary Settlement resources will decrease until the Player comes back to the area
 * Sometimes when speaking with sleeping dveler, he/she awakes and stand on bed - then it is possibility that he/she ends on roof of shack where bed is located, unable to walk anywhere.
 * The player can randomly teleport a short distance when aiming down a guns sight.

Xbox One only bugs

 * The player character doesn't speak, his/her dialogue is skipped entirely.

PC only bugs

 * Tab key stops working seemingly randomly and unable to access PipBoy or go back in the menus with it. Pressing the ESC key to get back to main menu, then return back into the game can fix this, without restarting game.
 * Going into the trade menu and clicking the "TAB)EXIT" button on the bottom can fix this.
 * Inability to access PipBoy may be caused by Steam Overlay on PC version. If one accesses the Steam Overlay using a combination that includes the tab key, but exits the overlay with a different key combination (such as hitting the Esc key), the tab key will become unresponsive in-game. This can be fixed by opening, and then closing, the Steam Overlay with the selected key bindings. For a more permanent solution, please consider rebinding Steam Overlay to a combination that does not involve Tab key.
 * For some users when using VATS, Workshop, or upgrading your power armor, the outline glow of a highlighted object will be replaced with a static glitch that takes up the whole screen and displays the same color as the normal outline would show. No patch yet but it does not effect anything else but your vision.
 * Volume shorts out at random times during gameplay.
 * Inability to shoot after exiting build menu too fast.