After unsuccessfully tinkering with ubi.ini for a while, I remembered that I had the same problem with Planescape: Torment and what I used to get around it: [url=https://rs236dt.rapidshare.com/#!download|236dt|72847117|D3DWindower-English.rar|437|R~0|0|0]D3DWindower[/url].
I figured trying it for Rayman 2 couldn't hurt, and it worked like a charm. Here's what you do:
1. Download D3DWindower from the link above (obviously) and unpack the archive wherever you want. I have it sitting in my GOG folder, but it doesn't make a difference.
2. Launch it. You should be presented with a window that looks somewhat like this:
Apparently these forums don't like embedded images. There's a picture behind this link. Minus the icons for Planescape: Torment and Rayman 2, of course.
3. Click on the blue
+ and find your Rayman2.exe
4. You should now have Rayman 2 in your list. Click on it once, then click the second icon from the right (the folder with a hammer on it) to adjust the settings accordingly. It's a bit of a trial and error thing, but these seem to work fine for me:
Another picture here. And another. Almost there. And here's the last one. 5. When you're done with that, simply click OK, then the Rayman icon again, and finally the third icon from the right (the little computer). If all goes well, Rayman should now be starting in windowed mode in whatever resolution you set it to in the ubi.ini file.
Have fun.
