If I open a FTP tab, then close it, Opus stops responding to keys. Up, Down, Enter, PgUp, PgDn, etc.
Only a restart solves it. Mouse clicks work. The process stays stuck if a button with Close PROGRAM is used (all listers close, but the process never fully halts).
This issue was present in 12.9.2 and now in 12.9.3 too.