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Hi Graham,
It must be frustrating, I had the same issue when connecting my cameras to the PMX in-build USB hub. Seemed to me that the comms from the cameras were 'overriding' the settings in Windows 7 for ports - this is a bad driver issue unfortunately and not something that I think SB can solve because when I un-plug my cameras from the PMX hub and use a trhird-party USB2.0 hub (powered, D-link 7 port hub) it all works without a glitch.
The trouble-shooting I went though was:
1. First to disconnect everything, remove the PMX device from device-manager, un-install TheSkyX ('TSX') and then re-install the software and driver from scratch. I then plugged the PMX directly in to the PC (no hub in-between) and tested it. Worked fine.
2. I then plugged in my cameras and the problem re-surface, so I went back to step 1 (un-install and re-install).
3. I then plugged in the usb hub and tested the mount. Worked ok.
4. Then plugged in one camera to the hub and tested. Worked ok.
5. Plugged in the second camera to the hub and tested. Worked ok.
After doing that, I'm conscious that changes to the configuration of what is plugged in where could cause this to happen again - to me it seems a fragile peace with the equipment but it will last as long as I don't change things around. Not the best solution because it means I can't use the hub on the PMX the way it was designed - but I don't think that this can be fixed unless all the manufacturers are squished together in a room to get their programming working properly.
In the future, I might get some equipment that is listed on the SB site as being supported by TSX, that might increase my options, but that's a budget issue and separate to getting it all working in the first place.
Last option I could suggest would be the power supply. If the mount is connecting and then stopping mid-way it could be that there's something in the power supply that is causing the mount to throw random errors around...
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