Well if a refresh generally fixes it for you I am not sure we are describing the same problem. I have did a shift-reload, reload, opened a link in a new tab, etc and the only way I have been able to correct the bizarre behavior is to log in to an alternate domain and close the affected tabs. FWIW - the bizarre font behavior isn't always the same - sometimes things are bold that shouldn't be - sometimes the font changes size, etc.
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