Are you POST'ing to a host on a domain that is not the same as the domain hosting the SWF?
Are you using HTTPS? If so, does it work when using HTTP? Does it happen in all browsers, or just a particular one?
Are you POST'ing to a host on a domain that is not the same as the domain hosting the SWF?
Are you using HTTPS? If so, does it work when using HTTP? Does it happen in all browsers, or just a particular one?