I have a few problems with the interface builder in Xcode 4. I am using Xcode 4.5, but the problems started even before I updated it.
My first problem is that if I edit a field (for example, a text field from a non-editable field), it sometimes disappears. Or other fields change their position.
My second problem, which is probably related to the first, is that the size inspector looks weird, and when I switch from another inspector, the size inspector I'm used to appears half a second before a new inspector arrives. I have two screenshots:
weird size inspector:

while switching between inspectors:

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