Seems Mstdn client (last updated 8/31/2017) finally stopped being compatible with new Mastodon versions. Opening Mstdn now just displays an error message. Tested on two instances.
Error text from mastodon.social:
Due to a bug in our code or a browser compatibility issue, this page could not be displayed correctly.
Try refreshing the page. If that does not help, you may still be able to use Mastodon through a different browser or native app.
Mastodon v3.1.0 · Report issue · Copy stacktrace to clipboard
Seems Mstdn client (last updated 8/31/2017) finally stopped being compatible with new Mastodon versions. Opening Mstdn now just displays an error message. Tested on two instances.
Error text from mastodon.social:
Here's what mastodon.social looks like: