Thanks, all running now. The cronjob.sh in my appdata folder was very old, so I grabbed it from Git.
There seems to be a couple of errors in that file (although my shell script is very basic, to say the least!): line 79 missing the i in if; "use_xTeveRP" isn't defined. Also the find in the cleanup section throws an error for me (find: -name requires an argument), but this may be my config.
Thanks for all the help, really appreciated.