Issues last 3 days with Yahoo Beta Mail (3/21/07)?

I have Firefox. When I'm deleting emails, I get a very large error message about strings and "the server failed to send back valid xml" and "xml parsing error, syntax error." "Contact Yahoo" and it gives some debug info. I had to printscreen the error msg. into MS word, and I can email the file to you with the exact wording. Plus, it's shut down Firefox entirely several times. I run Spybot and McAfee Virusscan once a week. I've switched back to the original Yahoo mail for the time being, but I haven't yet figured out if that's affected also. Please help!!!!!!!! Thank you.