Yeah, I found out early the persistent buttons didn't work.
Here's what's happening. The X axis DRO lablel/ zero button is actually an LED with two states, so that it turns a glowing green when ref'd. On top of the LED, is a transparent button using a transparent .png.
When I start Mach, I can home the X axis and the LED turns green. Then I click on it to zero the DRO, and I see the blue LED state on top of the green LED state. ( I can see the green glow around the edges.)
However, if I go to View >Load screens and reload it, it'll work correctly after that. Weird. Even weirder is that the run button is the same way, but is working OK.
Do you know if Bitmaps to back only affect the selected bitmap, or all of them? It seems like if I select the background image, and do a bitmaps to back, it actually moves the background to the back, but
only on that screen. on the second screen, it moves the buttons to the back

I think I need to load the backgrounds, then the LED images, then transparent buttons.
Wait, I think I have it figured out. The screen I've been playing with didn't have the transparent .png loaded for the transparent button.
Here's what seems to work. Follow the instructions I just mentioned, then, select the transparent button, then Edit>Cut and Edit>Paste Exact. Then right click and lock in place. Then it seems to work correctly. the buttons with LED's under them don't "depress" like the others, but they do change colors like i want.
Another thing that's tricky is making the dual state LED's, where one has a glow. Sizing is critical so they don't jump left or right by a pixel or two when changing state. Sometimes cropping from the edges can fix it, but sometimes I need to move the button by 1 pixel in Photoshop to get the spacing right.