my umask is correct, but is it possible that the joomla ftp layer was in cause ?
in fact joomla give the same permission than Filezilla.
i use a proftp daemon under gentoo but i can't see anything wrong into the conf. and i never have this sort of problem under joomla 1.0.0, my conf doesn't change since my migration to joomla 1.5. i will ask to a linux ie3 and post if he found the cause.