I have found that the “auto-update” functionality in Dropbox has some problems[^nowork], so people who have upgraded to [Mountain Lion](http://click.linksynergy.com/fs-bin/stat?id=r*bqlTuiXSo&offerid=146261&type=3&subid=0&tmpid=1826&RD_PARM1=http%253A%252F%252Fitunes.apple.com%252Fus%252Fapp%252Fos-x-mountain-lion%252Fid537386512%253Fmt%253D12%2526uo%253D4%2526partnerId%253D30)[^aff] might want to go to the website and download it manually.
[^nowork]: And by problems, I mean it never works.
[^aff]: Affiliate Link