So basically, range check: works on priest, doesn't work on mage.
Yup, the RangeCheck module doesn't work very well for some classes. I filed a Trac ticket with a patch that made some improvements but apparently none of the developers have bothered to take a look.
thx doxxx for replying and if the devs can take a closer look into the rangecheck module, it would be much appreciated! :)