Don't forget to come back here and mention if you manage to fix this. I'm interested to know the results.
I believe I was able to fix all but one issue. 18631 (which is also used by your mod to my understanding) is also used internally by SA-MP for the NoModelFile. We're told in the file to not remove or replace it, which I believe is the reason why I saw this (the other problems seemed to be ridden though)
(That burgershot sign was a hat)
I've been playing with this mod forever and just updated to the latest version.
I got the same issue when I use the supplied custom.ide along with the hammer thing you posted (i never used custom.ide because of this bug), allthough I havent noticed white texture bugs without using custom.ide. i still want to give this a shot.
Where do you make these changes in CUSTOM.ide or SAMP.ide?
Or even better can you post yours.
P.S thanks for this great mod blitz, best texture mod out there
With this newer version I do get some white textures without custom.ide.