Installshield hangs

I would prefer stay away from Installshield. I will never write my experience in this product in the my resume. But it happens, I must work with it "time after time"
Setup hang after finished whole work, and exited from any of my install script events.
Why?
Because I forgot to call SdShowMsg("", FALSE) in one of cases.
After investigation of the community I found, this problem happens on abort or exit calls as well in different versions. I have latest Installshield 12. Should Macrovision fix their bugs? No answer.