Nobody's perfect, so there will always be problems when introducing new software. The way you use Photoshop could be entirely different to the way I use it, and a certain combination of events could possibly crash it. It's not possible to predict every possible permutation without letting it into "the wild" so to speak. That said, to release an unfinished version to publicly beta test a product is a heinous crime. One which I know Microsoft and Corel do regularly. (Incidentally, Microsoft do not have bugs, they have "undocumented features" - yeah, right). That said, if a product regularly crashes or does not do what it claims, you are quite within your rights to return the goods, no matter what the licence or the shop you bought it from say.