I just registered today for the SD version and am needing to capture three video sources via usb capture devices. However, when connecting the third card, I get the error code that says there is a problem with the third source. So far, I have closed every input and verified that the usb capture device is working as long as it is one of the first two, then a device that was previously not working will not load. It acted as if it were the free basic unit that has a limit of two captures. I restarted....no luck. I reinstalled...no luck. I deleted, restarted and reinstalled.....no luck. I thought it might be an issure with using more than two of the same usb capture device, so I installed different model of device. Same problem. vMix will load any two in any order, but not a third. Help.

It doesn't seem to be a load on the CPU. It is still running fairly low.

Windows 7
HP 6000 Dual Core 3.0
4 Gb RAM
I TB HDD

Thanks...