Haven't installed the beta 1.5.26.05 beta yet, but have been playing 1.5.24 on fresh install with all my mods back except the housing ones. I started a new game, and it's been very stable, except for the water issue, but no lag, and no ctds. However, since I'm now a low level character, i installed one of the open shack mods near Riverwood from nexus, and bam, instant ctds on fast travel. Well, I unistalled that mod pretty dam fast, whent back to a prior save, and have been playing flawlessly for about ten, or so hours now. I must admit, Ive been to afraid to try 1.5.26.05 beta, but have heard nothing but good news about it. Maybe I'll give it shot tonight.