Th There are lots of bugs in Bethesda games when alt-tabbing. In Skyrim you would be greeted with a black screen when alt-tabbing back into the window a lot of the time. And when it finally decided to alt-tab back you would get the double cursor, the Windows cursor and the in game cursor at the same time, so nice. IN Fallout 4 I get the dreaded no weapon bug when alt-tabbing back. Upon a successful alt-tab back which without a bugfix I use would be about 1% of the time, I get greeted with an invisible non functional weapon. Usually a few minutes of switching weapons and switching from 3rd person to first and back will make it work some what for a while anyway. I'd say that and loading screens are about 50% of my 450+ hours in F4. Anyway the best workaround I have found is to not alt-tab back or heaven forbid click on the taskbar icon which presents it's own mess, I use an Autohotkey script to switch back with #WinActivate. For some reason this prevents any bugs with alt-tabbing or clicking the icon in Bethesda games. I still often forget about the keybind since alt-tabbing is such a part of my muscle memory. Sorry to run on but this mess is really unforgivable in a 2015 AAA game.