Your comments

I noticed today the "move on" prompt appears based on a timer too, and not just on points so that can probably be disregarded.  The FPS drops on the units tab is consistent though.

I presume I do not have the option to close this but it must have been a one time glitch, I replayed and all counters increased as expected.  As I could not replicate the issue, it probably is not a real problem.  Sorry for the distraction!

I pushed game speed to 150% and loaded up on units and did not experience any crashes.  The game slows down (expectedly), but still generally runs well and at a steady 20 FPS. I can open another bug if preferred but I noticed 2 things:

*The game really lags and FPS drops into the low single digits when on the "units" tab
*My Pet Dungeon / Lockshackle prompts to "move on" at 70,000 points instead of the stated 75,000 (the achievement activates correctly at 75,000)

Those are both off topic, but the main issue seems to be resolved now, thank you!

With the update, it does close properly now. I will uninstall again and test a larger dungeon soon.  Once I do so, I will report back here.  Thank you again!

I have not built a large dungeon to fully test after re-installing, however I notice now that when I choose "quit to desktop" the game locks up and I have to kill the running process for it to close. Since then, a 1.5 MB patch was released which appears to address that.  Do you recommend I uninstall and re-install