This started happening after I updated to OSX Yosemite. When I try to export a pdf (just a 4 page file, not even any images) InDesign crashes. The Problem report says :
Application Specific Information:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'NSXPCInterface: Unable to get extended method signature from Protocol data (NSObject / release). Use of clang is required for NSXPCInterface.'
Performing @selector(dispatchMenuSelection:) from sender DVAMacMenuItem 0x6180000f9b00
terminating with uncaught exception of type NSException