We had to take a few bug fixes before our final release, so here's an update. Get it in the usual places: (1) the download page (http://www.eecs.wsu.edu/paint.net/download.html), or (2) the built-in updater (File -> Updates -> Check Now, and make sure that "Also check for Beta releases" is turned on).
Also, our final release for v2.6 has been pushed back to March 1st. Previously we stated it would be out on February 15th, but we need the extra time to ensure high quality and to finish translation work.