I'm no expert on how the IE works, but I've been doing quite a bit of modding since i stumbled across this projects work. Firstly, I'd like to thank you guys for all the hard work!
I'm not sure why this is the case, again could be IE related. I've fixed my texture paths a completely different way with the spells/abilities I've modded. I simply loaded up a save unmodified, took the talent/spell and saved.
Then I exited the game, and copied over my modification and loaded up the save. I took note of any changes rest per day > to modular > out of combat..etc. I didn't activate the skill, since that seemed to sometimes cause bugs. Then I saved the game again. I exited the game again, and copied back over the unchanged/original file.
Loaded up the save again, and my modification had stuck (no pink textures). I tried resting, zoning, and even different game versions. From what I could tell it worked in 1.30, 1.30 with IE, and 1.3.530.
I'm don't have much experience when it comes to hex editing, but I got quite a bit of modding experience. From looking at the hex code of talents/spells; I saw no clear texture path. Is the texture path in only digits?
The only references I saw was lines starting with CAB-; which was at the start after the unity version, and further down in the code. The only file paths I saw seemed to be near the bottom of the code. I did perhaps see some kind of color/shader coding, but no exact texture reference.
Is the texture references not in the unity3d files? If so this may explain why what I did above worked. Thanks again for the hard work!