usually problems that occur because of new versions are because, something that worked through a bug, is now working as intended, its happened to me quite a few times, and when i look over the events whats going on makes sense. the easiest way to troubleshoot these things are to, well delete the old code and remake whatever isn't working properly. or of course see if you can find the source of the problem.
and if your still having trouble remake something similar in a new file and see how that acts.