I have this freezing problem as well, but I'm not sure if mine is related to disk caching. My caches are barely even in use, yet still uTorrent keeps eating up my system memory (grows up to 1.9 Gigs before eventually becoming really slow and then freezing). I have 200+ active torrents and close to a thousand all together, but I rarely download or upload much (and whether I do or not, seems to have no real effect on the memory usage). Never had these problems with older uTorrent versions, but then again, I never used them on this system. On this particular system I've only had the last two stable versions. But I am using my old settings from my old system and old uTorrent versions. I'm running 64bit Win7 on i5 2500k / 16 GB / SSD HDs. EDIT: Oh, and my uTorrent.exe seems to also be using 15-25% of my CPU as well.