This problem correlates with another thread [1]. On that thread, the issue was that the progressbars did not draw with the default windows theme selected. That has since been fixed with the latest patch. However I seemed to have discovered that if you have a scrollable grid w/ progressbars, the values get messed up by scrolling up and down. I'm sure this isn't by design. You can even grab the example project attached to the other thread, and change the row count to 100 (so its scrollable), and you'll see this defect. If you decide this is an official bug how long does it take before it gets released to the public? Or as a paying customer could we get a special early release?
[1] http://forums.infragistics.com/forums/p/4496/25023.aspx
You should Submit an incident to Infragistics Developer Support and include a sample project demonstrating the issue. When the issue is fixed, customers who reported the issue get put on a list and receive a private version of the Hot Fix before it is made public.