With my New R-Box I've now tried cgminer versions 4.3.3, 4.5, 4.7, 4.7.1, and 4.8. I've also tried BFGminer 4.10(I think that's the version). I've tried these at multiple frequencies, with different USB cables, on different computers, and on different pools.
The best results I've gotten are with pre-4.8 cgminer versions running 270 to 290 MHz. These results are typically about 90 GH/s reported by cgminer with lots of errors, pool-side usually comes out to low-70's GH/s with 15-25% error rate. cgminer 4.8 starts out around 70-80 GH/s, then settles around 45 GH/s with 2-3% errors. BFGminer reports mid-70's GH/s pre-error, but an effective mid-40's GH/s with a 35+% error rate.
I could be wrong... but I think I have a faulty box. I emailed the dealer tonight and I'm hoping they offer to exchange.
I contacted Jones Gear regarding my New R-Box issue and they agreed that I had done sufficient troubleshooting and that a replacement was in order.
They shipped me a replacement New R-Box with a return shipping label. All I had to do was take the new New R-Box out of the box, pop the cables our of the old one, put them in the new one, and toss the old one into the box they provided and return to USPS.
No additional configuration needed. Getting 110+ GH/s with about 5% errors right out of the box.
Jones Gear, you rock! I'm glad to have a machine running properly now and also glad to see it wasn't my own idiocy causing the issues.