Looking at your example a bit closer and I see something else... I don't think the !=* syntax is valid since it doesn't wildcard expand on groupnames.
You can use the "!=leechers *" syntax to disallow anyone in the leechers group while everyone else can perform the action. Or just "!*" to mean don't allow anyone to do anything. Or "=uploaders !*" to allow uploaders to do something but no-one else. You get the idea. Check out "site help" and at the bottom it should list an option for help on permission-flags...
Alternatively you can just use a user-flag like "9" or something, give that to download only users, and use that instead of the group to disallow actions that way. That's sometimes easier to maintain and the perms are a little simpler to process that testing a user's group membership...
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