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Two issues... so far
1. The case bends the right hand LCD screen up causing it to change colors from light purple to blue. No gap between base of switches and plate that could explain the problem. Case bends up LCD on left hand as well, slightly less but this do not cause color change. Looks like a design problem: Spacer Plate #1 seems to be 0.5-1mm too thin.
2. Right hand and left hand power up independently. Left plugged into Right OK. Right plugged into Left NOT OK: Right does not power up. I have not done anything else that plugging it in... no firmware tweacking, no layers set up... nothing. Could the Left hand USB 2.0 port be dead?
Contacted MD support.
3. I understood that both hands were independent when it comes to layers. Do I have this right?? When Left hand is plugged into Right hand and I press LOCK-1 or f1 command on Left hand, the Right LCD changes instead the left LCD as I would expect. I cannot check if this is the same with Right hand plugged into Left hands as this configuration does not work.
@Toma somebody mentioned if you have a sharp knife there are a couple plastic nibs on the back of the LCD that when sliced off allow it to lay perfectly flat with no flexing.
Re: independence of layers, they are shared when plugged into each other and independent when plugged individually into the computer.
@dragon788 I spotted these nibs on the back of the LCD and first thought they could be the source of the problem. But looking more closely, it was definitely the inside edge of the spacer plate#2 (bottom one) that was pushing up the LCD. After adjusting the screws and plates, I eventually managed to get the LCD with the same mauve color as the one on the other side. However, the situation is not 100% satisfactory as soon as I untie the screw, the screen starts changing color again... which means to me that there are still some pressure on the LCD and it is a very delicate situation (OK today but for how long?). I will see what MD comes up with, but I believe a slight redesign of the case by either making the spacer plate #1 thicker or trimming a bit off the Spacer plate #2 to avoid having its inner edge pushing up on the LCD.
Re:independence of layers... thanks for the clarification. So when one hand (slave) is plugged into the other one (master), if I change the layer from the slave, then only the master LCD will display the current layer, is that correct?? so the only way to have independent hands is to have them plugged into different usb ports?
I still suspect a defective USB 3.0 standard-A receptacle... :(