There’s some glitch happening with Antiviral and endless “Starting Caja…” Have you recently installed that program too?
I think there’s something buggy with how Caja respawns itself, since I can reproduce this too:
killall caja && caja
The correct way to “quit” Caja (which only re-opens itself) is this command:
caja -q
I’d suggest checking which extensions are enabled in Caja, and if Midnight Commander has an extension too, it’s possible this is causing the problem too.
PS. From your htop output, it seems a bit strange compiz is using a lot of CPU. Is that normal on your system?