In a nutshell, I personally think it's either an OS/driver problem or some sort of unknown incompatability issue that's going on here. Either way, I don't exactly think this GUI interface problem is currently at the top of Yuneec's list of things to get to.
It can't be the Typhoon because, as I already stated, I did have the GUI up and running 3 separate times with it; the interface just wouldn't stick. As far as USB cords go,one tech at Yuneec told me there was nothing special about their USB cord either. No dongles, nothing proprietary. She told me to use any USB cord I want, any length I want, because it didn't matter. Any cord should work, she said.
But I did get very different answers both times I called them, which I know does occur when making service calls. At one point one tech even told me he thought my Typhoon was bricked, but that wasn't the case at all, even though we spent a good amount of time pursuing that angle, too. Not having access to the GUI does not stop me from flying or enjoying my H routinely in any way whatsoever. Again, I would simply just like to have access to the heads-up info the interface affords Typhoon owners. The brief times I had it working, it looked like it could come in handy to have.
Not being known for my great runs of good luck in life, I at first thought that this was a problem I alone was facing, but I saw that others, too, faced this same problem as well. Like me, others simply gave up on it.
But doing that is kind of like having a horse with a broken leg. You can shoot the horse, but that doesn't fix the leg.