Hi Chris_K, the slider in this example belongs to the Opacity slider. My config is IMac27 3.8, 8 Gb ram, OS X 10.13. I think I will upgrade the ram by the end of the year, maybe 32 Gb, I think it will be enough to run the affinity apps.
First of all, sorry for my poor English, The first bug : You can't open a PDF file by dragging it on the Publisher Icon in the dock, you must first open Publisher and then go to the file menu open and choose the file In the file list. Second Bug : when I use the opacity slider or other, after closing the the dialog box, the slider still stays on screen. See the capture. And thanks for your job, the application seems to be in a good way.