I had the same trouble, when ever I would take a screen cap it would lock up on my and I would have to Task Manager to kill it.
After playing with the rightclick > Options > Preferences > General
and Options > Preferences > Video > Video rendering, it worked.
I did have YV12 and YUY2 both checked but until i unchecked then rechecking them and also in the Options > Preferences > Video > Video rendering I changed to Forced RGB Mode (from 'Use overly Mode 1') did it work properly. Just a suggestion
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