Cracked programs are also notoriously unstable because they have been modified from their original state. Crashes, freezes, corrupted simulation files, and inaccurate results are common. One professional recounted how a cracked design tool caused her laptop to freeze every time she worked on a project, costing her hours of stress and lost income. For simulation software, an unstable tool can produce incorrect results, leading the engineer to make bad decisions about mold design that cause expensive failures on the production floor.