I've made some changes to the power level cap messages. They no longer appear as validation errors - instead, if you haven't met the caps, a message appears at the bottom of the Powers tab (see attached image). I put it on the powers tab, since a lot of heroes add Protection or Damage to meet the PL caps on this tab.
If you don't like the message, you can turn it off as usual.
Also, a note on the philosophy behind this feature. It's meant to be a help for new players (hence being enabled by default); if you're new to the game, you may need some hints on how to make a "balanced" character for the game's Power Level.
Otherwise, you run the risk of taking a character who (for example) has capped defense, but only half the attack bonus he should have, because it sounds like a cool concept; then, half way through the first adventure, you find that you can't actually do any damage to the evil Dr. Molecule as he rampages through Freedom City.
Some of you have posted how players spend their time "min-maxing" their heroes, but isn't that really built into the game system? If you don't want heroes making PL 10 characters, shouldn't you limit them to PL 8 instead, and have them fight PL 8 villains? To me, a PL 10 game implicitly means that without traits at the cap of PL10, the character is at a great disadvantage against his foes. An experienced player might want to ignore the message because he knows the tricks to building a good hero anyway, but a newbie probably shouldn't do that.
Or am I off base here? Could the feature still use some improvement? I want to include it to help the newbies, but not at the cost of annoying everyone else. Let me know what you think!