There is no "XP penalty". Confuses grant bonus XP, and having Confused foes increases kill speed. The only way you're losing XP is if you're standing there with your thumb up your ass, doing nothing but watching.
Yes, yes, no, no. The conditional refers to powers which natively deal damage with no enhancements slotted. That includes pets, pseudo-pets and henches.
Check your browser settings, make sure the site is allowed to store content locally. Check the folder where the browser saves temp files, make sure it's not set to Read Only. Check your firewall, make sure the site isn't flagged for exclusion. Scan your HDD/SSD to be sure the cookie isn't stored in a bad sector.
Then find the cookie and delete it, manually log out of the site and log back in to create a new cookie.
She'd posted weekly status updates up to the second half of 2019. A few days after I found that, I read that Co* had been resurrected, so that was the last I saw of her project.
Illusion doesn't need -Perception or -ToHit for solo play. Superior Invisibility doesn't suppress unless you interact with an objective, and it doesn't matter if PA is hit or not.
It's a far more applicable power for defenders/corruptors/masterminds, most controllers can skip it or mule it. I'd respec out of it on my Ill/TA and Grav/TA, but 6.25% +Recharge at 4 slots is reason enough to keep it.