Hi William Wong,
You don't have to downgrade.
Restart potplayer several times and try f5.
When you get to preferences: find tree view, go to top, expand general, under general Skins. Press tab several times, make Context menu combox and change it to system dafult.
Context menu: System default
And save it.
I hope it'll get fixed.
Can you tell me how do you copy current time by pressing hotkey?