Hate to be a gadfly but designing a website that doesn't work with Explorer is a really bad idea.

Explorer has about a 75% share of the market.

I used to do this for a living and I know what I am talking about. Cleaning caches and other ways of optimizing your browser isn't going to correct poor web protocols.

This board is based on a system [UBB] that has a record of trouble going back many years.

My fear is that this great group of people are going to eventually tire of the site not loading correctly or whatever the problem is.