Likely rECAUde339ea33115: Conversion to WANObjectCache?

Since we changed the cache key, I wonder if this is due to wikis being on different branches. The steps to reproduce (from en:WP:VPT) line up properly with our different deployment groups...

1. signed into Wikipedia and noticed I wasn't signed into any other project;
2. signed in on Wiktionary and found I was logged into Commons, Meta, and Wikidata;
3. signed out on Wikipedia, and found I wasn't signed out of any other project;
4. signed out on Wiktionary, and found I was signed out of all projects

That said I couldn't reproduce using my "Lego-test" account in Firefox.

Few hours ago, as referred in Village pump, I also had problems with logins. My account (which was recently created) had no problems at the time I created, I was able to log in at Commons. Then later, whenever I tried to log in, only the home wiki (Wikipedia) could log me in, but the other projects gave me this output when trying to log in:

Login error
Incorrect password or confirmation code entered. Please try again.

Now I reseted the password and I see no problems so far (too soon to tell). I removed the character 'ç' from the password hoping that it would fix my problem, if the code was accepting only ASCII characters as password.

The tested browsers were:

1. Google Chrome 44 (stable) and Microsoft Edge on Windows 10
2. Google Chrome 44 (stable) and Firefox 39 (stable) on Android 5.1.1

Now I reseted the password and I see no problems so far (too soon to tell). I removed the character 'ç' from the password hoping that it would fix my problem, if the code was accepting only ASCII characters as password.

Which struck me as really odd, and potentially a separate issue. I opened T108221 to track that.