The new version of Google Authenticator (excellent provider of two-factor authentication for your Google accounts using your mobile as a secure key generator) force closes on open on CyanogenMod 7. You can fix it at a simple ADB prompt:

# adb remount
# adb shell
# cd /system/bin
# ln -s ../xbin/chmod chmod

It should now just work. Summary: it was looking for the chmod binary somewhere it doesn’t exist on CM7.