A new build is heading out today. We’ve been paying attention to the bug reports received after the launch of 5.3 to a larger audience and have fixed most of the major issues reported so far. Fixes include an XMPP crash, an IRC crash, connectivity issues with certain firewall setups, and a few enhancements to some commonly-requested features like the send button and service icons. Check out the full changelog here and thanks for your feedback! We’ll continue hunting down and fixing bugs!
UPDATE: Build 14 has been released to fix a bug with history not appearing for non-Pro users.