I downloaded SABnzbd-0.5.2-src.tar.gz and upgraded with SABnzbd+ Helper.
The package was stopped when I started the upgrage.
When I check Package Management, the version is still 0.5 but SABnzbd+ interface indicates that the version is 0.5.2.
NAS: Synology DS 410 (DSM 2.3) / 4 x 1.5TB SATA II HDD (Seagate ST31500341AS)
PC: Intel® Core i7 920 @ 2,66 Ghz / 6 GB DDR3 / 2 x 500 GB SATA II HDD (RAID 0) / Intel® Desktop Board DX58SO / Windows 7 Ultimate x64
DAV: Asus NovaLite PX24
Network: LINKSYS Gigabit Ethernet Switch