This is becoming more interesting. I can find this button in the attached html. So server returns the same response as for me (besides personal data). I have no clue what exactly is wrong but the problem is obviously in your browser. I would suspect ...

Hmm, that's strange. Just open broken page in Chrome, right-click somewhere and select "View Page Source", copy all content to a text file and attach to your comment.

Hi sez41 Could you please try to clear browser cache as first step? At least I can see both buttons in Chrome. If this does not help please attach sources of the page to the question (area with missing button will be enough).