I am on Win7 x64. I had utorrent worknig for 10d, ~80 downloads in parallel. I removed the anti-virus option, it is completely useless and doesn't seem to work correctly (it is blocked at some update from time to time). It's much better without it and very stable. I don;t see any issue memory wise, no blocking anywhere. I don't use the streaming/converting part so I'm mainly using it only for download/seeding. Compared to stable version, it seems to pick more sources and downloads are faster, which is awesome! See my previous comments: need 64b version. Need order to remain consistent when it restarts.