I am unable to open any IFC files with Revit MEP 2012 or 2013 ... there is simply no reaction once i select the IFC file and click Open. Revit doesn't crash nor do i get any error message, it just doesn't appear to even try opening the file.
No problem doing the same in Revit Arch + Structure 2012 and 2013.
I've uninstalled MEP 2012 & 13, reinstalled and updated to UR2 and no change.
I've also tried Graphisofts 'Improved IFC Impor' Add-In (which works in Arch+Str) and this at least gives me an error message - although not a particularly informative one (see attached)
This is occuring in a Windows 7 (fully updated) VM running under Parallels 7