It now works correctly! (?)
That's good to hear. Out of curiosity, can you think of anything you may have done differently or did the gremlins exorcise themselves?
Well, the latter, I think. For a short while... Next day I tried again & the problem was back. Then I saw:
Today I called tech-support and the tech suggested I try a reset which consisted of holding the headphone knob and the channel one knob down while powering up and keeping them held down until I got to the home screen.
Thanks for this. Actually, I think we need to produce our own TS version of the user guide, but without all the important stuff left out lol!
So I tried the system reset, & got a screen which says:
"formatting settings, please wait" (takes about 30sec before home screen)
Which cleared the problem. Great. So at least the issue appears to be software related & not the box itself. I plugged & unplugged the USB cable in various combinations of power up/down, and it continued to behave just fine.
Then I re-loaded my settings which I'd saved to SD card... But, on the next attempt at USB connection, it hung!
At this point, I did the factory reset again, and all was fine once more.
So I figured the problem is something to do with my saved settings. Fortunately the files are in .xml format, so easy to view. Every parameter is specified explicitly, so it's easy to go through line by line & compare my personal settings with the default values. Nothing seems obviously amiss or corrupt, though a few of the numerical parameters don't make much sense without specialist knowledge of the firmware.
So this time I re-configured the settings manually & saved them. As yet, things are working ok. So for some reason I might just have created a corrupt setup file the first time around.
And that, in a (rather large) nutshell, it where I'm at. But I'm treading cautiously...