Hi carnex,
Ebay has recently begun adding a captcha to the log-in process for account with passwords that are considered to be "weak". If this additional security measure was added to the log-in process when we attempted to place this bid on your behalf, that would explain why the "Invalid UserID/Psssword" status message was returned.
In any event, we would need to review your account to diagnose specifically what went wrong in this case. Therefore, for further assistance with this matter, I recommend filing a support request using the appropriate link on our help page: http://www.auctionsniper.com/help.aspx
-Mike