My app has a mode that uses the splitWindow on iPad.
The user can change functions which needs to change the tabs / windows available in the splitWindow masterView.
I do this by using TabGroup.setTabs([tabsArray1]); or tabsArray2. This will always work fine the first 2 times, but then the first window in one of the tabs will become FULLSCREEN and the app is effectively dead.
I have created as small an example as possible to illustrate the bug. Click the setTabs1 or 2 buttons a couple of times to see the issue.
I recently upgraded my SDK from 5.2.X > Latest GA it's moving to 6.X.X so this is a regression I believe.