The new Release 16.01 is out! You can download binaries for Windows and many major Linux distros here .
Are you still able to interact with the editor tabs (with the mouse) ?If yes, this issue might be fixed in trunk (svn r6924).
Just a small thing: In the Help->About dialog it says: "Build Dec 28, 2010".
In all previous nightlies it's the nightly build release date. Did it change now?