Yeah, it was likely just user error. I actually really love Draw Things, because I can run it locally on my mac and quickly experiment without having to sling HTTP requests or spin up GPUs.
I did the actual work back on March 11th, so I was likely on an older build; but I was seeing issues where inpainting was just replacing my selection/mask with a white background. I had the inpainting model loaded, but couldn't figure it out.
I'm planning to continue playing with Draw Things locally, and exploring the inpainting stuff. For such an iterative process I feel like a local client would make for the best experience.
That has been said, you probably used paintbrush rather than the eraser? There would be more help on the Discord server though! https://discord.gg/5gcBeGU58f
Tomorrow's release should contain both mask blur and inpainting ControlNet, which might help these use cases.