I was having problems with my site as well. Speed was signficantly slower and I couldn’t edit anything. I switched to Firefox and that solved the problem. IE9 stinks!
I only use IE and I wasn’t logged in at all, yet the changes still didn’t take when viewing through IE. I downloaded Firefox and the changes displayed just fine with that. I cleared the cache and even went through the steps to activate the w3 Total Cache and it still didn’t work. Is there anything else I can do?