I would suggest that all HPO 5 sites which experience this problem made a few tests. I don't have access to an HPO 5 system, so I can't make them myself: 1. Open a reader file via SIO, while it is open punch new files to the userid, then logout the userid with the open file and see if either the open or the new files are marked inuse. 2. Ditto, but open the file with diag 14. 3&4. Same as #1&2, except CLOSE C HOLD instead of LOGOUT. 5&6. Same as #1&2, except CLOSE C (--> purges the open file) instead of LOGOUT. If we can manage to find out when it breaks, maybe we'll be able to find out why, and maybe IBM can APAR it. Otherwise they'll keep saying it's a bug in the "customer program" and it works as designed. Eric