I got the 2.1.0.0 version to load, thanks tonyo. I neglected to dump temp files and run CCleaner after uninstalling the old drivers before, but I'm not sure that was the culprit. At first 2.1 acted the same as the others. I switched to a different USB port and voila, new drivers!
2.1 works beautifully with J. River 15 via ASIO, WASAPI, and kernel streaming. I tested all three.
I think the main difference between 2.0 and 2.1 is the HDCD indicator, but I'm not sure. I'm on a different PC right now. I'll check in the morning and see if 2.1 has the HDCD indicator "lights."
Here's a question: I've been thinking of upgrading to a Wireworld USB cable, but I keep reading some posts on various forums where people claim that you don't need a fancy cable with asyncrhonous USB. Wondering if that's true or not. I get great sound with a Monoprice gold plated cable, but, well, you know how it is. That little voice keeps asking if a better cable would improve upon it.
Sometimes I hate that little voice...