I am using EXT3-BOOT_LIVE-0.4.2.1 with .rootFS, and updated my box via svn to build 238, mainly to fix rtorrent problems. Rtorrent seems to be doing much better (runs without errors, even I still couldn't manage to download something) but there is another problem: I don't know if I should add this as a bug or not (since it is still not 0.4.2.2 ) but the problem is, when the box is restarted, rtorrent tries to check the existing downloads. So, it consumes majority of the CPU (I've seen 91.5% CPU time from top) which dramatically drops the response time of the box. Since it is a long process (line 10 - 15 minutes per 6GB torrent file) and performed for each and every download. When rtorrent finishes checking, CPU usage is b/w 0.8 to 3.3, normal boundaries and also releases pretty big amount of mem as well.
Btw, another problem that I've also figured out is, S96rtorrent init script does not run if dropbear is not running (e.g. SSH is disabled in S00config-options). I may missed it, but from the documentation around, I didn't see any warning about SSH for rtorrent as well.