Uh oh.
I'm suddenly seeing something odd going on with group members, and I think it may be related to the message you are seeing with the double quote and the character "@" being used all by itself apparently as a profile/user name.
Here's what I'm seeing that's new on my site-
In most or all my groups, when I click to "view All" group members, I'm now seeing occasional members with the default avatar and their profile name is merely: @
See screenshot 1.
When I click to that member's name or hover over their avatar, I get only a link to my site's home page.
If I click in the group grid to their "user config" page, I get screenshot 2.
If I then click to delete that member "@" from the group, I get the message "invalid user_id - please try again".
Something's going on and I'm not sure if these phantom members are being created from nothing and added to the group (that doesn't seem likely) or if they were/are actual members that have been stripped of their IDs somehow.
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...just another satisfied Jamroom customer.
Migrated from Ning to Jamroom June 2015