OK...After my last post I've tried LB2 without any Compatibility mode. I was able to finish the last two missions of the Azure camp. and I'm on the 2nd mission of my second Azerbaijan camp without anymore Debriefing screen problems. So to make things short, this was my final solution:

1. Fresh install of WIndows XP SP1.
2. Installed and patched LB2.
3. Added to the CA.ini
[Backdoors]
HEAP_PERCENT=0
4. Placed (and configured) the dgVoodoo on the LB2 folder.
5. Set LB2Config to 3DFX.
6. Set shortcut to:

Target: C:\WINDOWS\system32\cmd.exe /c start "runhigh" /high "F:\Games\FS\Longbow2\LB2.exe"

That's it, no memory limits or any other special config. The main tricks are (for me) the CA.ini and the Shortcut. Without the CA.ini I can't even run it and without the shortcut trick it stops working on when switching to debriefing.

Hopes this helps....
KC "The Punisher" Perez