@Neil, I don't have "corporate" but I tried a couple of the other Stardock Aero blinds and they work fine. Then I tried a couple of blinds that don't modify the min/max/close (at least not in an obvious way) such as Glassphire 2 and the problem returned. Funny thing, even choosing "don't skin the titlebar for this application" doesn't fix the issue.
Capturing the empty Excel window was by design since my actual spreadsheets contain financial data. You'll have to take my word for it that the grid lines remain invisible even when data is loaded.
My video card is an ATI Radeon 5570, driver version 8.98-120611a-141402C-ATI and I'm using Catalyst version 12.6, the latest downloaded a couple of days ago, but previous versions displayed the same problem.