I tried in urRAID 6.2 beta VM and I get the same issue.
[info] All checks complete, starting rTorrent...
2016-03-30 14:16:22,688 DEBG 'rtorrent-script' stdout output:
Script started, file is typescript
2016-03-30 14:16:22,689 DEBG 'rtorrent-script' stderr output:
script: cannot open typescript: Permission denied
2016-03-30 14:16:22,689 DEBG fd 16 closed, stopped monitoring <POutputDispatcher at 47934392589560 for <Subprocess at 47934392523952 with name rtorrent-script in state RUNNING> (stderr)>
2016-03-30 14:16:22,689 DEBG fd 9 closed, stopped monitoring <POutputDispatcher at 47934392576048 for <Subprocess at 47934392523952 with name rtorrent-script in state RUNNING> (stdout)>
2016-03-30 14:16:22,689 INFO exited: rtorrent-script (terminated by SIGTERM; not expected)
2016-03-30 14:16:22,690 DEBG received SIGCLD indicating a child quit
2016-03-30 14:16:23,694 INFO spawned: 'rtorrent-script' with pid 67088
2016-03-30 14:16:23,706 DEBG 'rtorrent-script' stdout output:
[info] rTorrent config file already exists, skipping copy
2016-03-30 14:16:23,708 DEBG 'rtorrent-script' stdout output:
[info] Removing any rtorrent session lock files left over from the previous run...
I'll be migrating from OMV to urRAID once 6.2 is final.