Tom,
we were not aware of this problem before, so thanks for discovering it! The problem is Mac OS X specific. We will be fixing it shortly and we will post a message on this forum when the patch is available.
In the meantime you can use the following workaround to change the height of a band:
1) Hold down Apple key and click on the band's header (this simulates right mouse click on Mac)
2) This should bring up the dialog where you can numerically change the height. When you click OK the bands will be redrawn with a new height.
We are not aware of any other Mac specific problems.
Best Regards