
Version 4.3 RC1 has now been released. This version is a feature release that introduces a number of bug fixes since the last release and some performance improvements and features. Upgrading is not immediately recommended for live sites due to a number of very complex core changes required for the performance improvements; these may have created some stability/compatibility issues (although it appears stable after testing so far).There have been no trackbacks yet
Edited 07 February 2012
Completely fails
I can confirm a fresh installation did fail when I tested over the weekend. It only seems to work when installing over the top of an old version.
I'm not sure why an upgrade would fail though, as despite there being a few bugs, a few people have upgraded their sites already. Any information you might have would be helpful.
I should explain 4.3 RC1 is something we recommended people not upgrade live sites too, and it's filed under 'Bleeding edge' – intentionally as we were concerned there might be some issues due to the internal changes. It's best to stick to 4.2.2 for now, although 4.3 RC2 or 4.3 final should be out soon.