External projector not being detected when running Leopard

We have recently upgraded a number of our instructor laptops to Leopard. Since the upgrade, we have confirmed an odd problem.
We have a number of multimedia carts in classrooms. The carts use an Extron VSW2 splitter to supply video to a ceiling mounted NEC LT280 projector. One input on the Extron device gets video from a CPU in the cart, the second input is for the laptop.
We have tested identical computers (2 - PowerBook G4 12" laptops, and 2 - MacBook Pro 15" laptops). In each case, one laptop is running OS 10.4.11, the other 10.5.1.
The computers running 10.4.11 detect the the projector and mirror the display. The computers running 10.5.1 will not detect the projector. The computers running 10.5.1 blank the screen when the video cable is attached, but nothing is displayed through the projector. System Profiler reports under 'Hardware -> Graphics/Displays -> Display Connector:' No Display Connected.
If I bypass the VGA splitter (plug the laptops into the VGA port at the wall plate which goes to the projector), both the 10.4 and 10.5 computers function perfectly.
If I do not have a desktop connected to the VGA splitter, both the 10.4 and 10.5 laptops seem to work fine.
I have contacted the vendor that installed the units – Extron has never heard of this problem.
Right now this issue is affecting several instructors, but later in the term, as students need to give presentations, this will turn into a major impediment.
My speculation (unfounded, at this point) is that Leopard may be reducing the signal/voltage being delivered to the video port; the result being that there is not enough signal to trigger the switchover in Extron device.
Any guidance or direction would be greatly appreciated.

I think that Extron has an loop through on Input 1 for a monitor. You're probably using it for the CPU on the cart. Try running the Macs into Input 1 instead of Input 2. You may get it to work. The proj output on Extron stuff is usually buffered so that the projector doesn't pass info back to the computer. If you go into input 1, the computer will "see" the monitor and output properly.
Maybe.
Mind you, that doesn't help a whole lot 'cause you need the monitor for the CPU, right?

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