Posted: Thu Jun 07, 2007 6:58 am
It sure sounds like a upgrade related issue. Best to call your Support provider, open a case, that's really where you should be taking this issue next if you haven't already.
We had the exact same problem with 7.5.1a - all IDoc loads failed including ones working under 7.1.
We went back to IBM and upgraded to 7.5.2 any things now work.