My gallery won’t load on the sims 4

ohoneyobee  Norton may be fine once reinstalled, or it may not be; the only way to find out is to test.  As for why this happened now, it's possible that EA changed something about the connection to the Gallery, a detail that shouldn't affect how users interact with the Gallery but might look suspicious to an antivirus.  Or Norton could have updated and become more aggressive in blocking certain kinds of behavior.

Please let me know whether Norton blocks the Gallery again after you reinstall it.  I'd like to be able to flag the issue if relevant, whether that would accomplish anything or not.