An issue I just started running into today: after clicking 'study' on a vocabulary schedule, then looking over the new terms, clicking 'Start quiz' puts the following in my url bar:
Which my browser obviously doesn't like because of the "location: " bit at the start (which presumably isn't supposed to be there).
Seen this both on mobile and desktop (using Firefox on both platforms).
I should also note that this doesn't always happen and after a couple of retries (dashboard -> study (next to schedule name) -> start quiz) I got through to a working quiz.
Thanks, I no longer get "location: " in the url, but we now have a new problem:
The "Start quiz" button takes me to ^this now. The rest of the page is just white. I discovered that clicking the back button on the browser takes me onward to the quiz though so keeping on truckin' for now.
Hmm - I was able to replicate and remove the issue on this end (thanks!) - let me know if it appears to be working for you.
You might have already noticed, but this was occurring for you when you had new terms to study, and you marked one or more of them as already known (or hid them from studying).