The only explanation I can suggest is that the upgrade broke the CC installation file (the APK). I know that this isn't a satisfying explanation, but given that hundreds of people are running Android 5.0.* without problems, it is the only one I can think of. It has also happened before, although rarely.
So, what to do? I assume you are running CC V4.1.4 from Google Play. I just pushed the V4.1.5 CC upgrade; you should see it in a few hours. Installing the upgrade might fix the problems because it overwrites the existing install.
If the upgrade does not fix the problems then the next (and only) thing to try is an uninstall/reinstall. Fortunately V4.1.5 contains the option to backup CC's database as well as the settings, so a reinstall won't be as painful as it was. We can go into how to proceed if we need to.
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