@chris Thank you very much for the quick response. Should I make a backup before deleting the cache?By clearing the cache, will the forum still work...

@chris Thanks! No, we don't use any caching plugins.Could it be solved by deleting the cache of the forum users? I didn't want to delete it in case ...

@chris Thanks! Hello,I was initially able to fix it by unchecking the "Disable visual editor when typing" checkbox in the user profile.But other use...