We use a development tool for City applications that is using the Motif widgets. When I have more time, I'll create a detailed blog about why we continue to use this product. It really works very well, and allows for developing business applications with just a few clicks.
I suspect Motif applications are not tested on Compiz heavily and we have two minor problems. If anyone wants to chat with me about a possible bounty, find me on the IRC as 'dave_largo' and private me to get my attention.
The first issue is that about 1 out of 100 times a motif dialog box will open as 1 pixel by 1 pixel. See the two shots below, one is how it *should* look and the other is how it looks when if fails.
(note small emerald container hovering over the application)
(The next time that I clicked on it, it worked fine)
The other issue is that this application loses focus when you move your mouse off the UI. On Metacity, it works correctly. So the users are having to always keep their mouse hovered over the top of this screen, which will force us to re-train people.