Move Torrent plugin works intermittently

[simonbcn]

I've enabled the move torrent plugin to move completed torrents between folders in the same partition.
It works in most cases but sometimes not, with no clear pattern.
There are other users with the same problem:
 http://forum.deluge-torrent.org/viewtopic.php?f=7&t=2275&start=0&st=0&sk=t&sd=a

[simonbcn]

The same in deluge 0.5.9.2

[anonymous]

Milestone 0.5.9.1 deleted