I did notice that changing that from the auto-detected compatibility settings caused it to not start. Also, I found only SSAA and integrated AA combined do a good job on all jaggies (fuzzy, but oh well), without causing additional glitches; and on my PC, turning off HW vertex processing fixed some stuttering. Texture flickering, stuttering around smoke, and all kinds of weirdness in fog, I could not get rid of.
BG&E was definitely playable, and no problems exhibited themselves in action-heavy scenes
(did get a, "no memory," crash after the final boss, and had to redo that fight to see the ending), but it came to mind since I recently decided to just put up with the weird boat camera and touchy boat controls, and get through it
(it was worth it, but I don't want to think how much time the looter's caverns took, with the camera circling all about at the slightest bump, or in a tight corner).
I don't necessarily know, without being able to change it, whether problems with fog are the fog or not. It's not like graphics go all weird and I can always pinpoint the problem, so much as I could usually spend 5-10 minutes checking and unchecking boxes until it got better, and 99% of the time, it would be either a fog or depth setting that did the job

.
I haven't used a Glide wrapper in
ages. Will check out nGlide!
Update: nGlide worked like a charm for Rayman 2, after turning off the splash
(the configurator worked w/ the splash on, but the game crashed on start). GoG's version has the Glide DLL in subfolder of where it needs to go, and the INI needed manual editing for the resolution.