We saw this problem when the Rev1 patch had not been completely installed on our AIX server (i.e. client was on 5.6 Rev1, server was on 5.6 Rev0). The patching process was complicated by the fact that AIX did not use the updated RAIMA database on Rev 0. Many of the files the patch expected to back-up did not exist. We needed to apply the Rev1 patch a second time in order to get it to finish correctly. Watch the list of updated files at the end of the Rev1 patch process to make sure it matches the list of files backed up at the beginning of the patch process.