I would suggest to try to plug the Gridseed directly into Raspberry with a known good USB cable. Make sure the Raspberry is powered off, plug in the Gridseed, power both on. If that works you can then test the hub.
That worked! Looks like one of my GSDs is DOA though, and that was the one I had pulled out of the box to test with so that definitely didn't make things any easier. By swapping the USB cable that was connected to the RPi to the different GSDs I was able to get them all up and running individually. I guess the usb hub I got from zoom hash was DOA as well. I've got another one from Amazon on the way so hopefully that's all I need to get them all up and running. Thanks for the help
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