We've decided to release a new version of PersonalBrain separate from the beta track. You can read all about it (and join the experiment if you choose to) here:
For your convenience, here are the basics (also on the page linked above):
Version 4.3 is "experimental" at this point because we believe it has the potential to overcome some problems of the current 4.2 beta release, however we are not sure. Why not? Because the problems we are trying to solve are quite uncommon and not easy to replicate. We're trying to make PersonalBrain as bulletproof as possible, so even though these problems are rare, we'd prefer them never to happen at all.
We decided not to make release this part of the main beta program yet because we'd like to be pretty sure that we have indeed overcome these rare problems first.
If this experiment goes well, 4.3 will replace 4.2 as the beta. Just in case you are wondering: Yes, 4.3 has all the great features that have been introduced in 4.2. When officially released, 4.2/4.3 will be a free upgrade to all PersonalBrain 4.X users.