Root Problem disabling system apps

Galaxy Tab 2 7", rooted w/stock ICS.
I've disabled/frozen most of the built-in apps, using either the disable option in app settings or Titanium Pro. Most of them stay disabled, but a few are getting re-enabled at every restart. Specifically Google Play Books, Movies, and YouTube. It doesn't matter if I disable them in the settings or with Titanium, same thing happens.
On my phone with ICS, I have the same apps disabled and they stay that way.