I have an app with a few docking panes. These can be moved around freely by the user.
But since we migrated to Dataflex 19.1 / Codejock v18.3 the docking stickers are gone.
With that I mean the icons on which you can drag the pane upon:

Click image for larger version. 

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So I can drag the panes, but there are no stickers.

Not much has changed with the migration to 19.1. Only some theme changes.
All properties are correct:

Set pbShowDockingStickers to True
Set pbShowDockingPosition to True

Any ideas?