I'm running 1.9.0. I got the announcement that 1.9.1 is out, but when I go to "Software Update", Octoprint says I'm already up-to-date and won't give me the option to update to 1.9.1.
Force check for update didn't help.
I had to upload it to my Google Drive because it's 8MB in size. haproxy.log is 8.6MB and tornado.log is 5.6MB.
OctoPi Version 0.18.0, running on Raspberry Pi 3 Model B Plus Rev 1.3