Unity 4.0 Tree Editor Bug (Cannot Edit Properties)

I've found a problem when attempting to create a tree in Unity 4.0.0.0f7., and am curious if this is happening to anyone else (a few googles and forum searches didn't turn up anything):

In an otherwise empty project:

Select GameObject > Create Other > Tree

Select the trunk node of the tree in the Tree panel of the inspector

Attempt to change the Frequency. This field doesn't accept numeric input.

Scroll down and attempt to change the Radius numeric input. The value doesn't save, and instead is persisted to the Frequency.

The remaining fields appear to be non responsive.

I've tried deleting and re-installing Unity 4.0, to no avail (thought perhaps assets had survived from my 3.x projects). Can anyone replicate or does anyone have any ideas?

Unity 4.0.0.0f7
Mac OS 10.7.5

 

Found a solution. For some reason, undocking the inspector window (I was in the standard layout) and using it as a floating window appears to have resolved the issue. I've re-docked it and it appears that the problem does not re-occur. Hopefully this will help anyone else that runs into the problem.