Yes im still getting issues with this in 4.10,
I really want to upgrade my pack JcInventory to get rid of all the currently necessary UMG hacks so the code can be learnt from easier. Submitted a bug report on the answer hub but the problem with that is i literally have no idea how to reproduce this stuff, it just eventually happens with complex projects- so my bug report is not really helpful i guess. Im sure that makes it really hard for epic as well 
**Arbopa **im afraid i cant give you any advice other other then to delete a few related classes and reprogram them, and test often to see if you can find the moment it breaks.