Illegal Operation Errors in CR6

[bujin]

Help!!! I've got a slight problem with CR6. I've created a report for work which shows the number of enrolments on courses on or after a date input by the user as a parameter. Each course in the college is associated with a particular school (e.g. Geology = School of Science, Maths & Computing), and also a quality assessment programme area (QAPA) (e.g. Geology = Q003 Applied Science). The user selects a QAPA from a list and the report finds all of the courses associated with the QAPA and groups them by school. On the whole, the report I have works. There are on average about 6000 records for each QAPA. However, with the QAPA 007 (Computing), there are almost 22000 records. It is only on selecting this QAPA that the following error occurs as the report tries to load:

DITARB caused an invalid page fault in
module CRPE32.DLL at 0137:066b12f2.
Registers:
EAX=0070e39c CS=0137 EIP=066b12f2 EFLGS=00010246
EBX=00000000 SS=013f ESP=0070e2ac EBP=0070e2e0
ECX=00000000 DS=013f ESI=06d182a0 FS=2fc7
EDX=0070e2d0 ES=013f EDI=00000000 GS=0000
Bytes at CS:EIP:
8b 07 8b cf ff 50 50 c7 45 fc 01 00 00 00 39 5d
Stack dump:
0070e2d0 00000000 0070e39c 06d182a0 06d182a0 00000000
06cb2f70 04144fac 00000000 00000000 0070e304 066b13a2
ffffffff 0070e310 066ae4e8 0070e2f8

(DITARB is the Report Builder for the Oracle database I am using - called DITA )

Given that it only occurs with this QAPA, I am starting to think that it may be a memory problem. Does anyone have any suggestions? I have also created a similar report which shows the number of male/female <19/>19 FT/PT/Eve students on the course and this one creates the same error when I try to load the same QAPA.

Any help would be gratefully appreciated. Not just by me, but by the Principal of the college, who wants these reports done pretty quickly!