I just updated the widget to correctly work in Mendix 6.9.0 and submitted it for approval with Mendix. In some way the new Mendix version seems to handle the loading of external jQuery files differently as opposed to i.e. Mendix 6.5.1. That is why I included a local
The widget update is not yet approved; you will see the update in the AppStore soon.
Regards, Ivo Sturm
Did you raise an issue on Github? (https://github.com/ivosturm/ColorPicker) It will be picked up there sooner then here.