Acrobat DC toolbutton appears as black square until you minimize/restore the Application window
Use 'Open' to add an Enfocus PitStop toolset. It appears in the right-side ribbon with the 'Active' icon. Click on this icon => it changes into a black square.
When using 'Add' to add the same toolset, it appears using the 'Inactive' icon, clicking it makes it Active but it is not showing the 'Active' icon.
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Bert Van Kerckhove
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Bert Van Kerckhove
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Tested with Acrobat DC 2019.010.20091, Windows 7, Enfocus PitStop 2018