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When I use the font picker on OSX, I keep getting a second font list panel.
When I select a text line with the text tool and open the font picker in the Inspector on the "system" tab, I select a font, then use the slider in a fast way to scroll up or down. A new font list panel will open at the left side and it will make the interface completely unusable.
This issue has been solved in PitStop Professional 6.12.