I've got 4 'things' to plug in, one of them being a 4 port USB hub which is also full. Any of those 4 devices work on the 'standard' USB ports, even on the front of my case that I plugged in a USB pigtail to attach from the motherboard to the front work perfectly fine (mainly a USB thumb drive). Any of those that plug into the USB 3.0 will either crash the system or at one point came up as an 'unknown device' the one time. Once my program started up though, it crashed during the part that I know it scans for the MIDI interfaces. This is a fresh install of Win7 64 on a brand new 1TB drive. I have hooked it up to the net and got all the latest updates from Microsoft. So, yes, I have tried other devices in the ports. Each device is different from each other too, no duplicates.
Devon