Ok,

Netarc has (accidently it would seem) discovered another feature on the MX950. When you replace text with graphics (as he did originally when he replaced the DVD button with a graphic of a DVD) you can select the TEXT button (look at his image at the top of this thread. Do you see TEX with a triangle over it at the top of his capture? That is the TEXT button) and cause the button to lose its ability to display text. This makes the graphics look the same but it allows the device name to still appear in tree view. Does this make sense?
If you unselect the TEXT button your ability to put text on a button will return.

Problem solved!

Thanks to YJ (one of our engineers).

Jeff