Hey Clarence-
Many of the reports for this issue have dealt with using delegates. If you have any in your blueprints I would suggest trying to remove and replace them with direct calls to the functions used. Additionally you can make a copy of your project for the 4.7 preview and test if the problem is still occurring for you there. If you are still having problems let us know with as much detail about the behavior you experience as possible to give us a clearer idea of what exactly is happening.
Cheers