Strange behaviour in the 'resume' pop up window

Hi, I just rendered an old course in HTML5 with Flash fallback and now the buttons on the pop up message that says 'do you want to resume where you left off?' just contain random characters - previously they said 'Yes' and 'No', now they say 'W:q' for Yes and 'Lm' for No (which seems to be 3 characters behind in the alphabet or -2 for the ascii values, except for the colon).

Is my file corrupt or is it a random error? Any help appreciated.

I can upload the file, but I don't want that to be public.



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