Yep. I've encountered that problem a few times over the past 3 or 4 weeks, and attributed it to Photobucket's adding new features, like video hosting. I also got an email yesterday asking if I wanted to renew my premium account, although I know it's paid up till October. I think the site is experiencing some glitches because of the changes made. Some members here have posted links to Photobucket that aren't showing up, too - all you get is a banner. I'm practicing patience right now - the kinks probably have to be worked out.
I haven't (to my knowledge) encountered problems with file size, but I did get an invitation to renew yesterday as well, Tricia -- I'm paid up until the end of December, so I think I'll just "practice patience", too
I had a bit of a problem with it, but mine was the opposite. I resiezed a bunch of my Marlee pics specifically for TCS, and then uploaded them to Photobucket. But when I posted the pics, I noticed they were all smaller than intended (like half the size) so i went back to photobucket and they had all saved much smaller. Wierd!