I have noticed the Box leds at the Soft Limits and the Machine Coord's button have a grey background, whereas the same Box Leds from the same bitmap file at the Offline and the Go To Z button is transparent in the center. This difference will be visible if the Box Led is a few pixels larger than the button inside and the background image is not gray where the Box Leds/Buttons is placed. I cant find where I define if the Box Led is going to be transparent/open in the center be "filled" with it's own background colour.

Any help is appreciated.

Found it. Had to open the box led png and specify the transparent color while saving to a new file. Don't know what happened with the "transparent data" to the original file. It does function correct on the standard screen set file though, but not on my modified set.

Didn't work!

When I close and reopens Mach3 the ref. buttons is invisible until I click on them. Then they stay visible  Arrgghhh