- does it crash when clicking in the spin button or when you try to load a texture? Textures are temporally disabled in Maxwell, it could be the cause of the crashes.
- does it crash if you disable the autopreview option of the material editor (right clicking in the material preview frame)
Please post here if you still have this bug with RC2. The bug was not in the weight spin, but in the preview engine. We have fixed a lot of areas of the preview and we can not reproduce here this bug. All the info you post here is very useful for us.