this happened in a tournament i was in after origins. A player there said that he could probability control an impervious and it was upheld by a level 4 judge at origins. as a ncaa baseball umpire i know not all umpires know all the rules correctly. I think this is the case here because impervious is not a roll made by the attacker on his turn. The ability clearly states your rolls on your turn their roles on their turn

You should of whipped out your trusty PAC and showed it to the judge!

I didn't realize there were different levels of judges. How do they earn experience points?

at one time you could do that with impervious and supersense. but you can't do that now sense it on your opponent turn not yours.

that is what i was thinking or the was making the story up sp he could try that stunt

There is nothing in the descriptions of either of those powers that prevent Probability Control from being used on an Impervious roll.

However, most of the time, you will not be able to use Probability Control on an Impervious roll, because the Impervious roll is occurring on your opponent's turn. Probability control only works on your rolls on your turn, or your opponent's rolls on his turn. Impervious is usually your roll on your opponent's turn.

Now, if your guy is being damage on your own turn (maybe you hit him with your own energy explosion, or the opponent is using Big Figure to attack on your turn), then you can use probability control on your impervious roll.

The important thing here is that it's not which powers you can use probability control on, but whose roll and turn it is.

Your turn, your rolls. Other guy's turn, his rolls.

Quoted for significant and elegant simplicity.

I believe the judge levels are long gone...that was before the belly-up of Wiz-Kids, during the clix haitus. If you were a level 56 back in the day, (if there was such), wouldn't really mean beans now!!!

Yeah, Judge "Levels" were only something that existed 4+ years ago. Now there are merely Rules Arbiters (ONE GUY), Rules deputies (Four Guys), and Volunteers. The person who gave you that ruling must be a holdover from days of yore. It doesn't mean they were WRONG (Allthough it likely sounds like they were).

What was the exact situation in which it was being used to re-roll impervious?

I am a level 757 judge. In my head.

No, it was never like that

Here is PC from Infinity Challenge
PROBABILITY CONTROL. This character allows you to re-roll a dice roll during your turn and forces an opponent to re-roll a dice roll during their turn. (Optional)
Once during your turn, this character allows you to re-roll one dice roll. Use the re-rolled result instead of the original result. This character must be within 10 squares of the figure performing the action and have a clear line of fire to that figure. Also, at any time during one opponent’s turn, this character forces him to re-roll one dice roll. Use the re-rolled result instead of the original result. This character must be within 10 squares of the figure performing the action and have a clear line of fire to that fi gure. In multiplayer games, you may use this power only once when it is not your turn. This power does not cost an action to use.

PC has always followed the same rules. It is just better worded now.