There's been a bug some time ago on holodeck where certain background textures/nebulas were flickering when moving the camera. It has been fixed, but now it's back on tribble.

Tribble - http://img29.imageshack.us/img29/839...2070415495.jpg
Holodeck - http://img818.imageshack.us/img818/4...2070416095.jpg

I'm not sure how these builds operate, and whether only some of the code is going Live or all of it, but I'd rather point it out now than experience these issues yet again once Season 6 is released.