Bug in 5.1.1 p2 and p3? Screen keeps blue

Unity Engine
1

I have made the update to p2 and later to p3 but with both versions I have a major problem:

I have a login scene which contains a main camera, a gameobject and a canvas with a panel and a button. I haven’t changed something on this scene since months but since I updated I get a blue screen in the webplayer instead of my canvas.

Within the Unity editor Game View I can see the dialog when I press play. When I look at the Scene view and select the camera I can see the blue screen in the camera preview field too.

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Is this a bug in the new version or do I have something to change?

2

I installed the 5.1.1 f1 again and everything works fine so I guess there must be a bug.