I realise this is late, but I've actually found out why that happens with the SR1 texture pack.
It has to do with a certain command in the lua not playing nice with modified time of day table files. I believe it has to do with making the game transition to rainy weather mid-mission.
I've fixed this issue by simply making the mission start off raining, put this file in your 1-MODDERS_-_PUT_YOUR_OWN_PERSONAL_MODS_HERE folder and patch.
Once again Buddy you're lifesaver!! Thank you
 
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