Notice: Constant CPT_VERSION already defined [...]
A constant is being used that is also set/used by a popular plugin, Custom Post Type UI (http://wordpress.org/extend/plugins/custom-post-type-ui/)
On line 29 of crop-thumbnails.php:
This isn't so much an issue/bug as it is an annoyance when working with wordpress debugging on. I love your plugin (as well as the CPT UI plugin), and also prefer to work in my wordpress installations with debugging active, so if this could possibly be addressed, that'd be great!!