trying to edit pages results in 406 error

I tried searching the forums but the topics I found didn’t help me out… I just installed wordpress 1.5 on my site, and everything is working fine — except for my pages.

I can sometimes create pages fine, and I’ve been able to edit a couple of my pages, but sometimes I get a 406 error (The resource cannot be displayed) when I try to submit an edited or new page. There’s no rhyme or reason to it.. nothing I think I’m doing wrong in the pages. Anything I can do to remedy this?