Hello. I believe I found a bug in the Service Pack 9. After upgrading my production to runtime 9, I found that cross-tab reports with large datasets crashed the website. Per the Windows Application Log, a fault happened in the crpe32.dll. So I uninstalled the runtimes for 9 and re-installed 8 and the reports worked again. My production uses the 64 bit runtimes.
I created a test site which includes a two datasets one large and one small with two reports, one cross-tab and another non-cross-tab. The site has four pages, one to open the cross-tab report using the large dataset, another with the same cross-tab report using the small dataset, another for the non-cross-tab report using the large dataset and the last with the non-cross-tab report using the small dataset. Only the cross-tab report using the large dataset causes the fault. I’ve attached the test site for you use as needed.