OK first of all;
1. Run Terragen 2
2. Run Debug Diag tool
3. In the initial wizard select crash, next, a specific process, next, select tgd.exe from the list, next.
4. set the action type to mini userdump, and the limit to 1
5. click exceptions, add exception, select stack overflow and click ok. You may want to add more exceptions for data misalignment, access violation and in page error.
6. click next, next and finish
7. go to the tools menu in the toolbar, select create ISS/COM+ Hang dump and click yes in the dialog box.
8. then hit ok and go to the Advanced anaylsis tab, hit start analysis and it'll eventually give you an html page. Save that and post it here.