Hi
Here are some thoughts:
Are you editing in a version? If you are building your parcels in a version, sounds like you need to do a reconcile first in the edit session. When you are editing, is the reconcile button greyed out?
In default, to commit a job, select the job you want to commit from the job book and then the commit button should enabled. The job you select in default might cover the area you are editing in the version.
let me know if any of this helps
Christine