IC-Switch 1.3 crashed opening the preferences window in Jaguar. Doh! So I just released IC-Switch 1.3.1 to fix this problem (thanks to Masato Ogawa for the report!).
If you're running Jaguar and already downloaded IC-Switch 1.3, just download it again from the same url. Sorry for the inconvenience!
If you're running Panther, you don't really need the 1.3.1.Download (440 KB)