There's not enough information to tell you what went wrong. But If I were to guess I would say either you included the wrong client.wyc file with your app or you didn't include the newest files within wyBuild.
- Double click the client.wyc file -- what's the version number both before and after the update?
- Open your wyBuild project and ensure the correct files are being referenced and you have no warnings when building your updates. If you do have warnings, read them and fix them.