We have had a handful of issues that most often affect isolated users on a server. It would have been nice to have customers who are normally active in the community or are critical to have participated in the BETA. Hint Hint :)
There have been a couple issues that have been server wide like the really large greylisting files that could cause high cpu. Even in those scenarios SmarterMail functioned but just a little slower than normal.
Chris had a number of mailboxes on his server that had spaces in the folder names that caused mailboxes not to be indexed which also impacted IMAP. Many of these folders didn't work in previous versions as well but because we have so much morel logging now, we can get a better idea of what is and isn't working.
The new SmarterMail will point out MANY more issues your serves may have had in the past but because of our logging and how we walk every file to convert or fix, it will bring MANY more things to your or our attention. That is the point of this version of SmarterMail, to kind of repair anything and everything that has existed for YEARS!
We had some pages that weren't updating with some stats like the IDS pages etc. on some installs. The IDS rules we added for customers and added as defaults were not very well defined and the culprit some lost connections. We were a little aggressive with our defaults and that will be changed. These new rules should be used to help protect your servers.
Chris has also been seeing more things than others because he has been installing test builds etc. Customers who have been using public builds would have seen less.
There is no doubt, this is a HUGE release and how we get much more performance out of SmarterMail. Chris's server is a good example on load times. His server would take over 15+ minutes to startup and now its under one minute!