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Bruce, try unplugging the cable you are using for StellariumScope, uninstalling the drivers, and plugging it into another port.
You may have to select "Show hidden devices" in Device Manager to find the cable definition when it is unplugged. Make sure you remove every instance.
You didn't say which version of Windows it is, or what brand of cable it is, but getting USB drivers working on multiple ports is hard work since a lot of manufacturers don't write smart drivers.
Once you have it working label each device and the corresponding port so you can always connect them the same way.
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