sending mail hangs interface

hi all,

wondering if anyone has had similar problems or has a solution. i
installed latest version of RC. when sending email in either Safari
or Firefox, i click the send button, the interface says "Loading..."
until it times out. the message is sent, and copied to the "Sent"
mailbox. however, from that point on I can't send any more messages
(after i manually go back to the inbox again) as the send button
stops responding. i'm having trouble finding a fix or even finding
the root of the problem. something is getting stuck.

any suggestions or inquiries welcome.

gabe