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Lottsa food for thought. I might try one mounted in the rear as that seems to be a separate hub. When devices get plugged into the front, system whined that it will run faster if attached to another port. Thanks for the tips.

Thanks Bob. I am beginning to suspect the 1gig memory on this machine is the problem. It is old enough that the memory can't be expanded. Vitamin D does seem to be a bit of a memory hog. It slows down any other app I try to run when the camera is armed. Maybe it's time for a new box :O/

There is one receiver per camera and each receiver can be coded 1, 2, 3 or 4. The computer is a PC running XP Home Edition SP3, 2.6 GHz Celeron, 1Gig RAM. I have 4 USB ports...2 in the front and 2 in the back. I have tried my Logitech webcam (USB) as one of the sources for Vitamin D and it works fin...

I have 2 usb cameras I want to use but can only connect to 1 of them at a time. I have verified that they both work...but only as singles. They have wireless USB receivers with 4 selectable channels for pairing. I have them paired as 1 and 4 but still can only get one at a time to work. HELP!! :O) :...