I'm on 0.64 (beta) now. Problem was happening on at least the last four version upgrades. I have completely uninstalled MC, scanned the drive for errors, and reinstalled MC at version 62. It must still be something flaky on my computer (Win 7 x32, used as Server) since my two Client computers (both Win 8.1 x32) don't have this problem and I upgrade them at the same time as the Server.
I don't know if this is relevant, but a lot of times I see two MC "media server running" icons in the taskbar, then when I move the mouse pointer over them one will disappear.
Lastly, maybe also related (I posted in a different thread) that a lot of times when I open Tools>Options window make changes (or just look at the settings without changing) when I try to close the Options window (clicking OK button) the window becomes non-responsive. I can click on the X on the window to close it, which brings up the Windows generic "Close program or wait for it to respond" message. I then close MC and restart. it doesn't do this all the time.