UE4 crash: compiling blueprint with UMG textbox (custom font)

I am developing a project in which I want to display video-textures with titles hovering above, similar to youtube’s videoplayer. The blueprint for this videoplayer includes a UMG widget with a multiline textbox (necessary for wrapping the titles in case they exceed the length of the player) using a custom font (roboto). When I adjust the widget and compile my videoplayer-blueprint, UE crashes very very often.