A quick look at the changes between 10.2 and 10.2.5 and it looks like the file has had a few changes which might affect the functionality. But I am surprised that there are no errors if it is just an access change.
An example:
Removed: OpenColorPicker(info)
Added: ColorPickerFrame:SetupColorPickerAndShow(info)
Aha, looking at the xml file - It has gone from a ColorSelect type to a Frame type.
<ColorSelect name="ColorPickerFrame" toplevel="true" parent="UIParent" movable="true" enableMouse="true" enableKeyboard="true" hidden="true" frameStrata="DIALOG">
<Frame name="ColorPickerFrame" mixin="ColorPickerFrameMixin" toplevel="true" parent="UIParent" movable="true" clampedToScreen="true" hidden="true" frameStrata="DIALOG">
https://github.com/Gethe/wow-ui-sour...ickerFrame.xml
Ace doesn't appear to have been updated since 10.1.5 but there is a ColorPickerPlus addon by them that has been updated sooner.
https://github.com/WoWUIDev