In the demo project called helpdesk/webmail on this location:
When i select the skin Office2010Black, Office2010Silver and Office2010Blue the skin is applied, but the skin selector disappears. Also the highlighted rows on hoovering (mouse move over the grid lines) goes wrong in the first two rows.
this happens in both IE7 and IE8. unfortunately I have to be compatible for IE7 & 8 also... can you figure out why?