Hi Rick,
first, I am a huge fan of high quality code - really love paint.net.
I installed 4.0 alpha 5086 over 3.5.11 on my german box. Then I noticed some inconsistency, not severe.
First, the UI was german, but the settings dialog said English. After selection of german again and a restart, it said german.
Second, in the installer I had the option "check for beta updates" on, but the settings dialog says off.
Good day
Bent
PS: German translation is partly poor. Will it be revised?