Checking the changelog for 1.0.22 it says something about clean up of proftpd script?
I tried to enable the FTP plugin and got this (which I've had since upgrading to Kralizec)
Failed to execute command 'export LANG=C; invoke-rc.d 'proftpd' start 2>&1': Starting ftp server: proftpdMEDIAVAULT proftpd[8063]: mod_dso/0.5: module 'mod_vroot.c' already loaded MEDIAVAULT proftpd[8063]: Fatal: LoadModule: error loading module 'mod_vroot.c': Operation not permitted on line 2 of '/etc/proftpd/proftpd.conf' failed! invoke-rc.d: initscript proftpd, action "start" failed.
Also on a more random note, when I upgraded, my sudo path broke - as "service" and other commands stopped working. One to watch for some maybe?