Cairo Dock Flashing Black Box on sub-dock

Hello,
I've been playing with different panels and I really like cairo dock. However, I'm having a strange issue with the subdock. Currently I have icons displayed from open applications and group them in the same icon. When I hover over it, a subdock appears. Everything works as it should except that there is a slight flicker of a blackbox after the menu fades away. I've tinkered with every possible setting and went through each option in compton to see what is causing it but no luck.
Has anybody ran into this issue? It's a quick flash of a black box in subdocks.

Turn off VoiceOver in the Universal Access pane of System Preferences.
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Cairo Dock Flashing Black Box on sub-dock

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