I updated to viewer 2.5 beta the other day, I tried it out and I'm kind of impressed with how quickly things are rezzing. It's a huge improvement.
However, I have had the same problem with viewer 2 since it first came out last year...
See all those weird glitchy marks in the water? WTF?! I'm particularly irked about this because I spent quite a bit of time taking some photos at Gulf of Lune. I think I was there for almost two hours.
So, after I take a ton of photos, I go to my desktop to open them, and they look like the one above. Any water pictures look absolutely terrible, which means I wasted my time with all those photos.
Viewer 2.5 - two thumbs down. Blech.