As we were troubleshooting the problem, we found the last known good dump (I pg_dump every four hours) was a month previous (sometime in April), when we made a change to ttracker_tickets's table.
From that time in April up unitl we last had this problem, openacs worked fine, but the dumps were missing all ACS related tables.
We have encountered this exact same problem again today. Originally, we thought it was due to a fault in our procedures in making the changes, however, this time, no one was altering anything. This appears to have happened sans any human intervention.
The following is a link to the last post we had with this same problem:
We are hoping that someone might have some ideas or any experience with this. Thanks!!