Is anyone else having this problem?

When I "Save Now" or "Publish Post" I get this message "Bad Request, Your client has issued a malformed or illegal request." However, if I go to "view blog," the piece is there. I have no idea what this means, but if you're getting it too, let me know and I won't blame my recent virus attack (Thursday). If you are getting this message, ignore it, or at least check your finished work. It just might be there.