Steps to Recreate:
- Install Solus MATE edition
- Open firefox, download any file | downloads toolbar button | open containing folder button. You'll see that this works on the clean install
- Open software, install all updates (this includes updates to mate 1.18 and an update to firefox)
- Reboot, open firefox | downloads toolbar button | open containing folder button
Expected: Caja should open
Actual: Firefox completely hangs
I don't know if this is a bug with firefox, mate or dbus, but I was able to work around this with the workaround mentioned in this bug report (comment 11) https://bugs.mageia.org/show_bug.cgi?id=18648#c11