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I just moved to Spain, and just played around with the beginners Spanish course. This is badass. Thank you for making this.

One issue I've run into a few times though: I'll come back to a tab for it and hit enter, and it seems to try and reload. I then get this error:

more_vert This is not a valid session ID. Note that this URL ist not valid across browser reloads.

I'm having trouble reproducing this. Could you contact me by email and tell me the exact steps?