Mac OS X 10.6 uses an old version of Safari (up to 5.1.10 according to this article). That old version of Safari is unfortunately not supported by the Dropbox web site, so this functionality, such as logging in to the Dropbox web site, is not supported in that browser. You'll need to update the system/browser. Apologies I don't have a better answer for you!
(Additionally, note that this page should be displayed in the user's actual browser, and not an embedded verison like this, per the /oauth2/authorize documentation.)
Ok than what is minimum MAC OSX version dropbox is supporting where everything works perfect?
Thanks,
Niral
That link doesn't specify anything about Dropbox developement APIs which we use in my MAC OSX application.