Even if MC would be "extrmely popular" (very, very doubtful statement) in the past, now it's getting real-pain-in-you-know-where.
Sad but true finale for unsufficiently considered software.
Before updating to Joomla 3.3 make this NOT OBVIOUS STEP to clear from unlucky software:
go to the Plugin Manager screen and Disable the System - MissionControl Support plugin. Then onto Extension Manager -> Manage -> enter Mission into the Search box and then click all the Mission Control results and choose to Uninstall.