“XdCam crashes immediately upon opening..”
If it’s crashing on launch and you can’t get to the prefs then move or delete the ‘Sony XDCAM Transfer’ folder in User/Library/Application Support (this is the default cache location– if you are caching elsewhere, you’ll need to go there and move/delete the above folder). This folder contains the cache and the application’s SQL database. After you move/delete the library folder you’ll get a blank source list and a setup prompt when you launch the application.
I’d just move it for now. If there are any negative consequences you can always put it back.
You can also try trashing the application’s preference file at user/library/preferences, though if it really is corrupt source info in the database this will probably not fix the problem.