For the sake of superstition, we are skipping beta 13, and hoping beta 14 will be better luck.
Mostly bug fixes in this version. Emails of type multipart/mixed were occasionally incorrectly showing up as plain text instead of HTML, now fixed. Errors with SASL not supported when authentication mode is set to auto have been fixed (in AUTO mode it will automatically retry in PASS authentication mode if SASL fails). Test account finally correctly reports UIDL support again. Some translation/tooltip things fixed on the main interface options tab. and a couple other minor things.