Sonarr version (March 12 2016): .3953 Mono version (if Sonarr is not running on Windows):Windows OS:Windows 7 Ultimate Debug logs (posted to hastebin or similar): http://hastebin.com/owusutiqox.tex Description of issue (if you think you’ve found a bug please include steps to reproduce): “This …

Mar 12 Update: Windows - Sonarr failing to start

Taloth March 13, 2016, 9:21am 13

FYI: You can’t blindly roll back without restoring the correct database too.

In any case, the above errors point to a missing .Net update (an rather old one btw). It should be a Windows Update.