[Zubersoft]

I'm very sorry to hear that you experienced that issue at the start of two different concerts. I will certainly do everything I can to investigate this and figure out if there are any reliability issues that need to be resolved. I've certainly never seen my Surface Pro 4 lock up like that and be unresponsive, so I will need to figure out how to reproduce what you are seeing. If it's a Windows problem (i.e. display driver issue, issue with the graphics device being lost temporarily, etc), then obviously I may not see it, but it's hard to determine that. The fact that you couldn't even drag down from the top of the screen to access the title bar to exit the application or drag from the other sides to multi-task or access the pull-out on the right side means Windows as a whole was probably frozen. MobileSheets is currently utilizing Win2D for drawing things on the screen which is going to use whatever graphics chip or card you have in the device. This may expose issues you wouldn't see with other applications that may be handling rendering differently. If you've used applications that are doing 2D/3D drawing and have never encountered this kind of issue, then there is definitely a relationship between what MobileSheets is doing and whatever stopped the OS from working. Any information you can provide in helping to reproduce and figure out the issue would be appreciated. Do I just need to try leaving my tablet asleep for periods of time and then loading it to see if MobileSheets or the OS has stopped working? How long was the tablet asleep? Do you utilize the metronome or audio player, or were you just strictly viewing songs? This will help me narrow my search. Also, were you loading individual scores or an entire setlist? Were there any applications open in the background?

Thanks,
Mike