[Zubersoft]

To my knowledge, only a handful of users have encountered this problem, which makes it much more challenging to solve as it appears to be very difficult to reproduce. I've switched my tablet over to the "speed" render preference and I'm going through large PDFs right now seeing if the problem will occur. The manufacturer of the PDF library that I use when "speed" is selected has released an update, so I'm going to include that in my next release. Depending upon the nature of the issue you've described, this may or may not help. I still don't really know what's happening, and until I can reproduce the issue, I have no way to easily fix the issue. I'm happy to test with the same PDF you are using if you think it may be beneficial.

Thanks,
Mike