They post this message when you place your question to “Bug Raport” category. In far in past AnwserHub was used for bug reporting, but it stream lined and move to separate site. Don’t know why they keep category is still here, but as said there form now for bug raporting. Also what you posted is not really a bug as it not reproducible and it is unknown if it’s a cause of UE4. Stack you posted seem top be form render thread there no main thread stack also if it fronze on Windows code