The files you upload are MuxMan files. That's not what I asked. I was asking for files from the second picture in post #12 above. You have to export it first.
Anyway, the MuxMan files are fine. I use the demo to replace your menu background after a 2-disk merge, and the menu displays perfectly fine with WinDVD6 and PowerDVD6.
Did you use "Replace with still" to replace your customized menu - Step 5 of the GUIDE?
This guide is plain and simple. I don't understand why you're having a hard time with it. The demo is working fine in this aspect, otherwise we would've noticed it many months ago before the release.
Possibly something wrong with your software players? You can try other software players, like Media Player Classic, VLC, Nero Showtime. How 'bout burn to a RW and test on your standalones.