Thanks, Nvidiot.
I tried 600 on another computer. It turned out that it was not recognized there either. That meannt the problem was with the 600.
I tried a 'reset' on 600. Somehow it fixed the problem, so far. I tried both 300 and 600 on the original computer. It seemed to be working right now. No slightest idea what happened and how it was fixed. But very happy it is working now.
Thank you for your help!
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