This question about Configuration: Needs followup in Tasks
escaped characters processed when adding users to group
The Main/WikiGroups Add members processes character escapes like the newline \n. This is a problem because running foswiki 1.1.9 on Windows IIS7, using windows authentication, sets the REMOTE_USER to DOMAIN\name. So a user can be entered using a double backslash, but if another user is added or removed, it reprocesses the character escape of users already entered.
--
SeanOConnell - 31 Jul 2014
It is probably best for now to manually edit the Group topics. Use the "More topic actions" link at the bottom of the page, and then edit the topic settings.
Unfortunately we don't have any developers with a windows domain for testing and development. This needs a new task in the
Tasks.PlatformWindows web. And needs a developer willing to help fix this along with access to a windows domain.
--
GeorgeClark - 31 Jul 2014