How to reproduce:
1- Enable "Show Objective" via Map.
2- Get a quest showing a POI on map.
3- Open tracking on minimap with right click button. (do not close, do not select anything)
4- Open minimap with the M keybind.
If you can't reproduce, reload your UI and try again step 3 and 4.
I'm also having random lua error sometime DropDownMenu.lua at line 656, UIDROPDOWNMENU_MENU_LEVEL being nil, when I play with unitframes dropdown. :/
I would like to know if some addon authors have the same issues since a couple of beta builds on beta/ptr.