HELLO MY FRIEND
I found a solution that fixed all the missing texture bugs for me. It seemed to have something to do with the new update moving the PBO files around.
I'm not 100% sure if you need to opt back into the 1.62 older steam version. I did just to make sure.
But here it is:
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Make sure you ran regular Arma 2 (not Operation Arrowhead) at least once, it creates important cfg files.
Now simply go into your regular Arma 2 (not OA) directory, copy the 'Addons' folder and paste it directly into your OA directory. Making a new folder. (That used to be there until the recent updates)
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STAY OUT of OA/Expansions and the 'Addons' folder, inside that one. These are already fine and if you copied anything there, idk what could go wrong.