Edit: also, I was using an app called Power Manager to apply battery profiles to my phone under different circumstances, I.e. when it is plugged in, it brightens the screen and stays awake longer, when running on battery it dims screen and sleeps often...well it still works, but only manually. Its supposed to apply the profiles automatically for a given event like plugging in the charger, but since I rooted I can't get it to do it automatically, I hafta go in and select the profile manually...any ideas?
Go in Power Manager and make sure the dot next to "Monitor" is lit up red. If not, tap it once and you're set. If that doesn't help, I'd suggest uninstalling and reinstalling the app. I'm using it on the JF RC33 update with no probs.