Error 404 - Page not found

Hi, I get the 404 errors now much too often when updating changes in wordpress blog (

I have similar, if not exactly the same set-up on numerous of other hosts but this error happens only with Dreamhost. Sometimes I have to refresh up to four times before I get back to the wp admin page I was trying to update. In some (rare) cases, the updates were not done when I finally come back to the page i tried to update.

It seems to be some time-out that is set too narrow.

Please help! This is getting an nightmare!