I'm using the full version of Artrage 6.1.2 on Windows 10 Pro Version 1809 (OS Build 17763.914).
I recently installed Artrage on my new Windows computer, and it seems very responsive until I try to save the painting. When I try to save, Artrage stops responding, and eventually I have to kill the process.

I'm working with a 10Kx10K image, and I've tried saving smaller images; that seems to work. Similar images have saved successfully on my Macbook Pro, but on my PC it just freezes. There's also a black rectangle around the progress bar, which I found a bit odd.

Is it possible this has something to do with the fact I'm using some of the new custom brush features in Artrage 6?