I have upgraded WordPress to 3.1 and GD Custom Post Type Tools to Version 1.3.3.
The existing post types I have had for the past few months now prevent me from posting a in a new post type or editing a current one. The only option I have is to 'View'.
I have reset the capabilities as requested in the instructions.
If I create a new custom post type however it will work - but as you can understand I have several entries in my current post type and cannot access or add to them.