This is fixed in recently uploaded 0.6.4-1. Changelog says:
0.6.4 (20100612)
- Fixed bug: need double-fork on Linux (spotted by Joey Hess joeyh
at debian.org)-- Sergey Svishchev -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]

