I installed version 1.5.201.0 (which is what is listed in the Windows Store) and then when I clicked the "Minecraft for Windows 10 updated!" notification that appears on the bottom right corner, the game looked normal at first, and then after the white screen with the Minecraft logo but before the menu screen I got a popup that looks like this:

The background was the same background that menu screen uses. Clicking the "OK" button (which is the only button onscreen) will take me to the menu, when I restart Minecraft or it crashes, the same popup appears.

This is not a major issue with the game, but it does bother me because I have to keep clicking on the OK button every time the game starts.