ArcMap 10.1 crashes when opening mxd in previous version with maplex on

Discussion created by esiddorn on Oct 22, 2012
Latest reply on Jul 23, 2013 by rborchert
A lot of my maps were using the maplex extension for labelling.
We just upgraded to 10.1 and everytime I open a map that had maplex turned on the mxd crashes. 
If I get to the pause button ontime I can switch the properties back to the standard label engine, but it's getting rather frustrating.
Any fixes for this?