Web Login Fails First Time, Works Second?

From the main login page I get a failed login, which redirects me to another login page that looks different (more minimal). That login works. In the login it says I had a failed login, but the password was definitely correct (I even used copy/paste). This happens on two different devices, both 6.1 (recently downgraded from 6.2), both RB2011s, and both using Chrome. Clearing the cache makes them work for a while, but then they start doing it again.

Thoughts?

I am seeing this in the chrome javascript log.

GET http://10.0.0.1/jsproxy/?%00%00%00J%00%00%00%C3%B2P%C2%9D%C2%98%7D%C3%8C%7F…A7xS%C3%82%08%C2%8E%C2%97%C3%B5h%1D%2C%C2%AF%C2%95%16%C2%9B%C3%8A%3F%C2%B8 404 (Not Found) engine.js:740
fetchFile engine.js:740
loadSkin engine.js:777
start engine.js:1078
(anonymous function) engine.js:1083
Session.decrypt engine.js:53
(anonymous function) engine.js:748
req.onreadystatechange