Same thing here! I'm on IE also and it did get very slow on the Auctiva website. I even did my spyware/adware, reg clean, etc. and nothing worked. After it sped up, I got the "not responding" crap. After thinking all was well and was able to put about 12 auctions on (took 6 hrs!) I am now having to log back in after every click of my mouse! I guess I'll quit for the night and try again tomorrow.
Good luck!