The problem is that there are mask images inside the theme default.dll that don't allow you to modify the shape of buttons when making a .crx theme. That is one of the reasons that I stick to modifying the .dll instead of making .crx themes.
So you have two choices:
- Modify the shape of the button masks in the theme .dll so that your buttons will work with your .crx theme
- Create a .dll theme (<-- Its your best bet )
...unless Waha knows a way to change masks using the .crx file, that is..
BTW, nice theme!