Yeah, I could as well, but I had no TV...This 4KJ issue got me curious, and I went and checked Pandora on the Hopper 3. Things seem to run fine there, with the ability to change stations and actually hear music without barfing.
On the 4KJ, even if Pandora was hung up, I was able to use the Home button to get back to something else. No unplugging or rebooting required.