If you are experiencing weird textures when you load your save slot, you will need to delete your files from %localappdata% in the latest Shadowforge folder. Probably only savestate.dat if I'm not mistaken, have not tested it yet. I just deleted them all. But .png files should not interfere with the textures on the UI.
If you hold down CTRL + O you can have your primary brush color on your secondary "background" color as long as you have it held down.
And did you know? Shadowforge has a website and forum. Join the community at www.theshadowforge.com.