Hi. I'm having the same trouble as @konansock with not being able to Alt+Tab or Windows Key to switch to other programs (e.g., firefox, discord) mid-game after switching to dx11. I have one curved screen monitor, no others connected. I have switched to Windowed Fullscreen and that has allowed me to switch programs mid-game. Also having the black photos issue. Here's some details you asked for, and attached is the dxdiag txt file.
Platform: PC, EA App
Which language are you playing the game in? English
How often does the bug occur? Every time I open the Sims4
What is your current game version number? Latest Patch - 1.107.112.1030
What expansions, game packs, and stuff packs do you have installed? All but simtamates, poolside, and fashion street kits.
Steps: How can we find the bug ourselves? Load into a legacy save to see that photos taken (not on sim's cellphone) are black/blank. Download art from gallery and it is black sometimes. Try to Alt+Tab while in fullscreen display and it won't let you switch screens.
What happens when the bug occurs? Pictures are black/disappeared. Art is black/disappeared. Sims4 stay on screen display without switching to other display/screen/app, etc.
What do you expect to see? Sims pictures and art displayed as per normal. Able to Alt+Tab out of Sims4 mid-game.
Have you installed any customization with the game, e.g. Custom Content or Mods? Tested with no mods or CC in gameplay and on the gallery - still the same problems. Added mods and CC back in and still the same problems.