Why does your appraisal software crash more than ever?

With the mandatory UAD updates, the industry is full of complaints about some software vendors' latest versions crashing all the time. But the jump in crashes didn't start with the UAD — it just made it worse, and drew more attention to a long-standing problem. In fact, ask around and you'll see that over the last couple of years, since about 2008, appraisers have complained more and more about software crashes and stability. But why?