DMC Zsigmond

I'm using dual 580 GTX's in non-Sli on 275-series forceware beta drivers, along with another machine using a single 480 GTX with WHQL-certified 270-series drivers and I can confirm there is some kind of weirdness going on. About a week ago, everything was running fine. Actually, in my 5 years in SL since 2006, it probably the worst login and avatar loading performance I've seen. LL needs to slow down on the Viewer dev and make sure major compatibiliy faults don't find themselves creeping into the main viewer. I also have an 6870-based AMD Radeon machine on 11.5 Catalysts and using the latest snowstorm DEV viewer crashes the entire AMD-ATi computer as soon as I turn on Depth of Field. Haven't been able to reliably log on the Second Life for several days. I'll clear cache, it might work for a second login, but then until 3rd login I'll start as a cloud with my L$Balance locked at $20L. Inventory is viewable but not loadable and parts of the simulator fail to load full prims. Also getting messages from Linden saying there is degraded region performance. I've never experienced SL quite as unstable as this...???