The titans are all level 1 or better explained they have no leveling mechanics.

We will have to look into the save/load issue though.

I think it is an Unity issue, because when ever we got any crashes reported recently, then only after tabbing out and then it crashed on tabbing in or short time after.
Unity does for example not render the scene when there is no focus but does it again when focused.
I suspect there is something not working correctly recently.
However they just released version 5.4.2 which comes with a plenty resolution and rendering related bug fixes.
We will update to this version for next Patch and hope it will end this series of crashes.

If you would catch the moment it happens in a little vid this would likely make more clear how it could be triggered.
Maybe you just do something different than I do and thus I fail to trigger the problem.
Just one extra question: was it on a large custom map? Which one was it?

Can you attach your output_log.txt after triggering the problem? (Before restarting the game)
See: http://brightrockgames.userecho.com/topics/118-how-to-submit-a-bug-ticket/
So we can see two things:
1) Which game version you have.
2) If any error occured causing the UI issue.

Correct Lee, it was the Blade Lotus Knock Back, which was able to shift units first above and then in chasm.
Will be fixed next Patch :)

This will be fixed next Patch :)
(finally)