Unreal Engine 4.6.0 on Fedora 20: Project Browser problem

Development Programming & Scripting UI
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See this video, clicking on project browser button cause UE to become unresponsive, seem to happen to different file browsers on many desktops in Fedora 20. Tested in Gnome shell, XFCE

Fedora 20 64-bit, Gnome shell 3.12.2, GTK 3-3.12.2-2