http://bugs.winehq.org/show_bug.cgi?id=34039
--- Comment #6 from Yanis Lukes Pendrokar@gmail.com --- Update: This is a visual error. I managed to log into the Asset Store and download a free asset. The import window works as normal and is visible.
In the default Direct3D mode for Unity Editor, the Asset Store window shows up gray. In the forced OpenGL mode for Unity Editor, which crashes on standard Wine version, the Asset Store window shows up black.
This same issue also occurs on Windows(even with interactive elements), which is sometimes fixed by unticking a "Use DirectX 11" checkbox, but no explanation has been given why that works. I have never had that option enabled when running with Wine.
Also occurs on - Wine 1.7.22