Re: [CURRENT ISSUE 64-bit] red flashing game window

@billionaire531  That doesn't qualify as custom content unless you also used cc items in the build.  If not, try deleting the ground lights in your second screenshot; I know those are among the many objects that cause flashing when object hiding is disabled.

If you want, you can also send me your save, and I'll poke at the house a bit to see whether I can figure out what's going on.  To do this, you'd open Documents > Electronic Arts > The Sims 3 > Saves, right-click on the folder for this save, choose Compress, and then upload the save to a third-party filehosting site (Google Drive, Dropbox, etc.).  If you don't want to link it here, feel free to send me the link via private message.