Can't add people to usergroups.

[vector2012]

Dear,

Everytime if i want to add an user to a certain usergroup, i'm getting this message: vmError: User name in use
And i always getting redirected to some weird user.

Strange bug or just a setting wrong?

Running PHP5.3 and latest VM 2.6 version.

Could anyhelp me with this?

[vector2012]

Noone that knows an fix for this bug? Cause it's not an setting...