I've got 2 units, and both have the dimmer problem. I've tried as suggested above with forcing power mode using hijack, but it did not fix it for me. I've also tried removing hijack so we can rule that out. In fact, I've tried everything!

I emailed support, and David Moss is arranging collection for a look (again he suggested the power supply on the display) but this is before I found out my backup unit had the problem. Maybe he will want both.

I just can't see how it's a hardware fault as it's not as if the dimmer can't achieve 100% brightness, it just seems confused If somebody can give an explanation of the fault on the power supply, that would help us understand.