Fix for bug #12607 (https://gna.org/bugs/?12607).
This bug was reported by Chris Brosey (chris dot a dot brosey att vanderbilt dot edu).
The problem was that the fixed flag was being checked for all spins. However deselected spins should be ignored.
Authored by: bugman 2008-11-20
Parent: [r7991]
Child: [r7993]
