Hi Elvince & all,
We are currently preparing a 4.9.2 that we intend to release later this week. It will include a fix for UE-20792 (DrawMaterial() Function not Rendering Translucent Material to HUD), as well as about 20 other fixes for major bugs and crashes. Some of the other important fixes included are for issues such as: crashing when undoing in blueprints, child blueprint classes unable to change values for inherited variables, Chinese language users crashing when changing the language settings, the inability to submit to the Apple store for iOS9, and more. Full details will be made available with the release of the hotfix.