I am bashing my head against the wall with this bug. When you have parts that are mirrored and or linear/circular pattern, the parts are changing to "named configuration" in the part properties (right click in the mirror or pattern). When you go back to select "configuration as pattern seed component" it will accept the command. Switch configurations and it goes back to "named configuration". This is extremely aggravating when you have a assembly with 400+ parts and your entire tree is yellow or red.
Has anyone found a Rx or patch to fix this problem?