Dragon Age: Origins
FYI: Prior to correcting the issue I did attempt to remove the "effect" by using "*" on the CH trainer. Since my solution was born solely out of luck and not ingenuity, I figured it is best to share the conditions I had before my "effect" finally ended.
If the game is saved with the effect active (and stuck) then it doesn't go away. For other party members it resets if they're removed from the party and later put back in (possibly just going to camp may reset other members).
But the reason why the above post worked is that the effects wouldn't normally "stack". If being on fire is the timer that got stuck, then walking through fire or getting set on fire resets the timer for how long until the fire burns out. So if you have the Instant Cooldowns on the trainer turned off and get hit by the same effect then it should countdown & remove the effect properly.
Thank you for reporting it, that helps a lot. Of course people stuck with knockdown/knockout effects are still out of luck. But since I don't touch the Instant Cooldowns anymore it has never happened to me again (plus I don't use the stealth trainer option either).