I'm having an issue at work that is becoming very problematic. It only seems to be me that is experienceing this at the moment. My indesign 5.5 keeps crashing when I open a file from another version of indesign. I also have a message from the extensis suitcase saying it cannot load - but other people in my workplace have that message as well and it doesnt cause problems. I removed the SING folder as recommended in another post but no change. The program loads fine and if I open a file that was created in 5.5 it seems to be ok but if I open from another version, like CS3 it crashes.
As is consistent with your narrative, the crash is in Extensis Suitcase Fusion. So you'll need to contact Extensis to get this resolved.
As an interim step, you can remove the autoactivation plugin. /Applications/Adobe InDesign CS5.5/Plugins/ExtensisFontManagementIDCS5.5.
thanks for your quick reply! will try your ideas.