After several weeks of slow rezzes, crashes, and constant cloud avatar images I fixed my Second Life experience tonight. The newest Phoenix viewer works like a charm.
Here is how I did it. I took this advice from the Phoenix Support Pages on how to do a clean reinstall.
Basically, my older viewers were in conflict with each other -- and files were corrupted.
This is what I did:
1. I removed every instance of a Second Life browser in my applications. I had 8, since I experiment with everything out there. I also removed my Hippo viewer for open sims since it resembles Second Life so much.
2. This is more difficult. I am not sure if it is necessary. I cleared my settings. I then went back and collected my text conversations. You can read about this in the clean reinstall pages.
3. I logged into Hatton, a quiet sim. Then I waited for my inventory to repopulated. Presto, everything worked just fine!
I urge you try this with Phoenix or any other viewer if you have problems.