BUG? Camera rotation on x set to 90!

Hi,

I'm having a really strange bug with Unity 4.1. I cannot put the rotation of a camera on the x axis between 87.5 and 92.5, as it will automatically switch it to 90 when I hit play! Any other other value is fine... I tried with an empty project, no script, just a camera, and it happens too! Does it happen to other people as well?

Actually it does it with any object: if I set them to 88 in rotation on the X axis and hit play, the rotation comes to 90 automatically?? What's going on....

Nicolas