Hi Footman,
Thanks for all details in your report! I was able to reproduce this behavior using latest 4.7 branch, and have entered a bug report for developers (UE-8654). disappearing menu and crashes appear to be related. I’m glad you found a working commit for now. Keep in mind that 4.7 branch is being updated constantly and is not considered stable at moment. I’ll let you know when I see an update on this bug. Thanks again!