I've noticed an issue with Windows Glow, I was in http://www.uesp.net/wiki/Morrowind:Arvs-Drelen and there are Fireferns in the upper dome, when looking at the windows through the plants you can see the alpha channel around the leaves, it appears as a solid grey texture.

I'll post a screenie when I get home but I'm curious if anyone else has noticed/fixed this, I've tried using the vanilla Firefern texture but the result is the same.