In answer to your question here...
Flash the old version ".5" back, then open the ".6" version using Root Explorer/ES File Explorer/Astro and goto the /system/app folder and delete the Clock.apk or ClockPackage.apk and save and then flash the ".6" version without wiping and that should give you ".5" clock.
Too many steps.. but you did give me an idea so THANKS !! I just extracted the apk and it installed like a normal app and then I used the SDX removal app to delete the old clock and all is well.. The alarm woke me up this morning just fine.