General :: Deactivation Of Device Administrator Fails

after receiving the recent update for my HTC One X (stock ROM, now Sense 5.0 and Android 4.2.2), the Notes Traveler app for my work e-mails is causing problems (it seems to lose account information regularly and notifies me of failed sync). Since it is about to be replaced soon anyway, I wanted to uninstall the app, which is not possible.

I tried to deactivate the device administrator for Lotus Notes in the system security settings. The checkbox remains checked after deactivation, although there was no error message.I tried to uninstall the app using the app management in system settings. However, the button for uninstalling is still deactivated.

When I go to device admins again and tap Lotus Notes in the list, it asks me if I want to activate it as administrator again. So here it seems as if it was removed from the admins, although the checkbox in the list is always checked.The same happens when I start Notes Traveler while Lotus Notes is seemingly not an activated administrator. I can then re-enter my password and the sync works for a while (less than 1 day) before it loses the password again and re-entering won't fix the problem unless I try removing Lotus Notes from the device admins (which causes all Traveler data to be wiped).

So it seems that the removal of Lotus Notes from device administrators does not work properly. Although I am asked for reactivation when I start the app again, the administrator is still active somewhere in the system and prevents uninstallation of the app.

I already asked HTC support but they only wrote that the system update often cannot be extracted completely and the only way to fix it was to wipe the phone. However, I never received any error message during or after the update and everything else is working perfectly well. Therefore I doubt that it is caused by a failed system update installation.