Graphics rendering improperly after Big Sur update
I recently updated my macbook pro (13", 2017) to Big Sur and it appears that graphics are not being rendered properly in a number of applications. One example is in Excel, where drop down lists created through data validation are not rendered. The lists exist, but they are not visible on the screen, so I have to select menu options blindly. I've encountered a similar issue in other programs, so I am certain that the problem is not Excel. I am running the latest release of Big Sur (11.4), which I updated to from High Sierra. Any recommendation for how to trouble-shoot or resolve this problem would be greatly appreciated.
MacBook Pro 13″, macOS 11.4