All Dockers disappear if I drag a Sticker onto the canvas (ArtRage 6, Docking Mode)

[Somerset]

Hi ArtRagers!

I have a problem with the Sticker Sheets in ArtRage 6.1.2. By dragging Stickers, all Docks get displaced by grey areas (as you can see on the screenshot at the left and the right edge), and in fact the Docks are all closed then and can't be opened again until a restart of ArtRage. It only happens in the Docking Mode and only if I drag the Stickers outoff the Sticker Sheet onto the canvas. If I click onto the Sticker in the Sticker Sheet, the Sticker gets placed on the canvas and the Docks are still there. Seems to be a bug, I think. Or is this just happening to me?

Edit: My OS: Windows 10 Home Edition 64 Bit. My Computer: Dell XPS 8930, Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz[Cores 6] [Logical/Core 2], 6 GB RAM, Nvidia GeForce GTX 1060, 6 GB.