ah but this is a huge clue.
so you are saying that if you go to the Process Tamer process tab, and change the priority manually, then you CAN change the priority, right?
it's just when you try to make a rule to do it then it failes to do it automatically, is that right?
Process Tamer is designed for speed and low cpu use - when it tries to tame a process and fails it wont try again.
it may be that (as part of protection), there is something that causes the rule to fail (or apply and then have priority changed back by protector).
if this is indeed the case then i can probably change the rule system to try like one extra time after a failure (say after waiting 1 second), which could fix the problem.
but before i add this i need to know for sure whether when you set the priority manually from PT process tab whether this works or not.