al'be:do

What OS are you using, WinXP SP2?
Didnt see it in your specs or instructions.

Im not so sure you need the DDU patch if you
intend to use 3DFX and glide wrapper because
the default render mode is 3DFX out of the box.
The DDU patch was to give the display engine a
DirectDraw upgrade instead of 3DFX for the non
3DFX video cards like the old TnTs. If you use
the DDU mode, one has to make sure to add the proper
lb2cfg lines are added per the procedure outlined.
Plus selecting DirectDraw and the video card too.

Also note that Win Compatibility toolkit does two thingS:
Memory lie (limits to 336mb) and sets the windows95 compatibility mode.
So if you dont use this ToolKit, it can be replaced by the other "tricks" that do the same thing, such as:
Win95 mode set with the desktop icon, allocator or boot.ini for memory limiting.

Different hardware and OS configurations seem to
respond well to different combinations of the
tricks or workarounds we have documented.

Glad you found one that works for you.
And thanks for spending the time to report what combo worked for your rig.
Everyone that is successful can help others by doing the same.
Yours might be the first documented international patched 2209i LB2 rig.

minus the politics of course j/k