Hmm, after it had been running that way for a couple weeks, it finally stopped when I:
1. Enabled permissions on a couple more sources (don't think this was it, but it might've been) 2. Clicked the annoying banner in the upper right that was telling me I had more items to review (for my "getting started" tour, I think). It seems that when the upper right area has pending items, the app stays in a loop where it uses CPU every millisecond.
One of those two fixes caused it to finally stop burning up my CPU/battery. Hope it helps someone else.
@Bill - I had the same issue. I love SnagIt but was getting ready to uninstall it due to the CPU impact on my machine. I too just clicked the yellow banner to see if I can resolve it before going the uninstall route. Here's to hoping that fixed it...