That's the whole thing. It seems that with Ketron, sometimes it is a bug that will affect every unit, and other times it is a hardware/quality control issue that won't affect every single unit. I updated my SD4 and SD40 yesterday, and I still have a USB issue with the SD4. I was reading on the vArranger forum that some units have the issue and others don't. The SD1000 has the same issue; some units can be powered by USB only, many others don't. Someone found out that it was some cheap part in it.
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"You Shall Know the Truth, and the Truth will set you free." John 8:32