I upgraded a 2.1 site to the latest 2.2.4, and the Google Docs repository (enabled and visible) is not showing in the file picker. I thought this may be an upgrade problem, so I tried a fresh 2.2.4 installation. There are no Google Docs in the file picker there either. Google Docs is shown in the file picker using Moodle 2.1 and 2.3 (Oauth2 registered) on the same server. Lastly, demo.moodle.net is running 2.2.3, and Google Docs shows there.
I will report this to the tracker, but I want to confirm it is affecting others.
We have had this issue reported as well. I am currently investigating it.
A patch has been added to the tracker. If you could test it and report the results that would be great.
Yes - same issue here (on a fresh installation of 2.2.4).