Hi Gypsy!
Glad to hear you find the extension useful :)
Regarding the color group save problem, if you could tell me the steps before you run into the error, that would be very helpful for me in order to fix it. If you have the time of course.
For the scale problem, there is an easy fix I can do on my side. I could reduce the fixed amount of color groups per page and make sure it does not prevent users to close it at the highest scale value.
Hope it answers your comment for now.
I will try to find the time to fix for those issues, but probably not this month.
Thank you for your feedback :)
Cheers!
Jon