After this update and a few hours of playing I haven't found any black texture, not in PoP at least (and it was FULL of them).
A few problems remain:
• regular crashes, but not every hour, the time limit is now around 90 minutes/2 hours, I need to play more (and to take note of the time when I start) to see if it's always the same time;
• trying to configure the beta and choosing a mod crashes the game, I tried three times - the only thing I can do is to change to the "regular" version, configure it and to change back to the beta, updating (again!) and playing;
• some mods, like ACOK, load completely and then immediately crash.
Hope it helps.
Luciano
Edited to add:
I'm using an iMac, 24 inch monitor, 3.06 GHz Intel Core 2 Duo, 4 GB RAM, NVIDIA GeForce GT 130 512 MB, OS X 10.9.4