The progress bar appears to be stuck at 60% and still exists after the PCI/PCI-X customization GUI is canceled.
When the customization GUI is launched, the progress bar goes from 40% to 60% and seems to hang. The GUI will still launch and is usable. After the GUI goes away, the progress bar will be visible for a moment and then disappear. This does not affect the functionality of the UCF generator; it is only a visual issue.