Yesterday's build has a few things that I'm fixing in today's new build. Hopefully I can get the final build pushed out to everyone for this weekend!
To get this update, make sure you have "Also check for pre-release (beta) versions" enabled in Settings, and then click on the Check Now button.
Direct download link: https://www.getpaint.net/files/zip/test/paint.net.4.201.7152.40366.install.zip
Changes since 4.2.1 beta build 7151: