Mainly a maintenance release but some nice enhancements in it:
* Legacy MDI (Multi Document Interface) has been removed completely
* Use Ctrl+Tab and Shift+Ctrl+Tab for switching main tabs
* Added quick connect sessions via drop down menu of connect button
* Session background color
* Date time editing fixed
* Various bugfixes
Download your copy.
Note that if you use the original 4.0 RC1 release your auto update mechanism won't update to this new release as in that older release it was broken (caused by the "M" in "r1901M").