Is there a Unity 5 Bug affecting tags with Android builds?

After spending most of last night adding debug comments and rebuilding the project I finally broke down and built a new project this afternoon and did some simple collision and tag comparisons testing with cubes and everything seems to work fine.

My next guess is something happened with the project upgrade. So I guess I will be exporting assets and rebuilding my project from scratch tonight. Hopefully that fixes it and I wont have to rebuild the objects themselves.

I actually took the assets from my working test and imported them to my 4.6 upgrade package and they started doing the same thing once in that package.

Hi, known issues are listed in our release notes (for future reference): http://unity3d.com/unity/whats-new/unity-5.0

I have done a quick search in our bug reporting system for your issue (you can also do a search on our issue tracker: http://issuetracker.unity3d.com/) but haven't found yet a reported bug for a case similar to yours. Let our devs know by creating a bug report: http://unity3d.com/BugReportingFAQ

I had a problem like this and solved it this way:

Try checking the tag list in editor going to the "Add Tag" menu and check that the tag you are using is there

I had my "Pick Up" prefab with the "Pick Up" tag and the "Pick Up" tag was showed on the inspector for every "instance of the prefab" (I don't know if you say it this way)

But then I checked the "Add Tag" menu and the Tag List was empty, so there was the problem.

I had the same problem on android device. In my case I removed a tag and Unity needed to update the tag list, so once reloaded the project worked fine.