I see something similar though not as bad on my HTPC Server. I wake the HTPC from sleep using my Harmony Remote, which also turns on the TV and Receiver. MC starts clean with Theatre View displayed correctly. I try to navigate using arrow keys and get half a menu or selected media transition which then just stops updating, sitting there apparently doing nothing. Arrow up and down gets no response. Then after a while Theatre View responds, usually to all button presses in a "catch up". I don't need to restart MC or the PC and can continue using it without issue.
I always assumed that MC was waiting for hard disks to spin up to get Cover Art or similar. But the issue doesn't always correspond to hard disk activity as shown by the HD LED. Or at least, not a lot of activity.
I have also seen some possibly HDMI sync issues since early MC23 versions, where the TV will change colour slightly of backgrounds on the MC Standard display, and then adjust back to the correct colour, usually a little while after I have started MC in Standard View, or switched to Standard View. I have assumed that to be an HDMI issue.
So something is going on, and it isn't a good thing. I am using OpenGL.
EDIT: Okay, I had better update video drivers. My 1060 should be supported for some time.