I experienced the same problem last week. Sonar Platinum kept crashing due to a specific plugin issue. And twice I submitted my report (with comments) and had the same experience as the OP. When I clicked on the link that said "see your report here", it took me to a page that said "you don't have any active reports" (or something like that)
It's been suggested that someone has to manually enter these reports into the system before they show up on that page. So if that's the case, why not change the message of either the "see your report here" or the " you don't have any active reports", to something more accurate like, "Your report is pending, when it has been reviewed you will be able to see it on this page". Otherwise people are following the link, hoping to see the report they just submitted only to see NO report and wonder if it was submitted at all.
And no, I am not running my version of Sonar in demo mode. It's fully registered.