No preview while capturing in FCP7?

We have two FCP setups. Each one has a Blackmagic SDI capture board. One is a MultiBridge Pro II, the other has a Decklink SDI board. Both of the Macs are identical, MacPro 3,1: 8 core 2.8GHz Xeons with 6 and 8GB of RAM. They have the same graphics card and are both running Mac OS X 10.6.8. They both have the same version of the Decklink software, v9.2.

On the system that has a Decklink SDI board, when we capture we get a preview in the Log and Capture window, as well as a preview while the capture is in progress.

On the system that has the Multibridge, we get preview in Log and Capture, but not while the capture is in progress. Instead, we get text that says Final Cut Pro, above an apple logo. the status at the bottom of the capture window says it's capturing and in fact, the resulting captured file is fine. This used to work fine, until a few months ago. I don't know what changed that may have cause preview to go away, but we used to see it on that system.

Are we missing a setting somewhere that might be causing this? it's really annoying to not be able to see where a capture is at, or that it's working properly

thanks.