Is there any more information on the mshtml.dll crash? It has become a very regular crash while trying to build / design OLAP reports using I.E 7. The crash always occurs going to "view" mode or opening the report folder.
I cannot say for sure, but it sounds like the same problem as Ron is having. However I "fixed" it by going back to ie 6. Perhaps RP or MS have issued fixes since Nov that will have fixed the issue.