i have 2 custom groups with =many members and 4 custom groups with few members . so whenever i install a new module and going to groups --> " my custom group " i see all permissions( access module/block) has set for groups with many members ( same as registered users group ).
i had this problem with 2.0.7.3 and now have it with 2.0.9 beta too.
it seems a bug and system take all groups with more than X members as "registered users" group.
regards

This is my pet peeve for default behaviour when instaling a module.

Actually what is happening I believe is that permissions are set to match that of the user doing the install. All the groups that user is a member of get rights to the new module (and block if you create a new one).

It makes for a messy cleanup afterward. The workaround is to have a webmaster user that isn't a member of any other groups.

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yes thats it. i found the reason finally.thank u.this is not related to the number of members of that group. simply i am a member of that group so when i as a webmaster install a module all other groups that i am a memebr of get rights to that module.

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but i must be a member of other groups because we have a rule in my site that a special group have the permission for enter to a private forum and any user also webmaster must be in this group.
btw will this be modify in the future versions?