No there is no horizontal variant anymore if you use the auto-updater, you must have used the manual install as well when reinstalling, otherwise I don't see why you would have that file.
Anyway the issue must be with you uisettings.ini file, and I'm a bit mystified why deleting it and loading the settings from a toon that works had no effect. I take it you already tried toggling the "frame only" setting back and forth? If all that doesn't help you'll probably have to start clean without loading your alt's uisettings.
Btw for testing without getting a group you can paste and execute this into the control center window:
parent.parent.GroupMembers.GroupMember1.MemberInfoPage.Visible=true