Release notes for each V4 beta release are gathered here.
V4 is a major rewrite with changes on many levels so please be on the lookout for any bugs.
The main new functionality is that MoI is now a 64-bit program for both Windows and Mac and the Mac version is a native build and doesn't use Wineskin anymore.
New system requirements are Windows 7/8/10 64-bit or macOS 10.8 - 10.13 .
Polygon conversion can now use all your system memory instead of running into 32-bit memory limits.
A lot of various little quirky things should be tuned up for the Mac version.
The only known areas still not quite working yet are snap text labels and dotted/dashed line styles in viewports and Mac trackpad gestures aren't fully functional yet.
Fix for the frozen UI bug when restoring a maximized main window from a minimized or hidden state. Please let me know if you see it again.
Fix Mac deployment issue that was preventing things from working on OS X 10.8 and 10.9, MoI should run ok there now.
Fix font name bug where MoI V4 would overwrite the UI font name property that V3 uses in moi.ini and so the V3 UI font changed after you ran V4. They should now stay separate.
Fix bug where dropdown controls in commands wouldn't reinitialize to their last used value. Reported by bemfarmer in the forum here: http://moi3d.com/forum/index.php?webtag=MOI&msg=8675.204
Fix construction line snapping bug reported in the forum by Moujiik here: http://moi3d.com/forum/index.php?webtag=MOI&msg=8675.119
Not a whole lot of changes, normally I would have waited until a bit more were batched up but the frozen UI bug was pretty significant so I wanted to try and nail that one down soon.