I sent an email to IR a few days ago and got a fairly long response. Then they followed up and released this, which reiterates their email response:
While one can never take management of any company at face value, at least they denying things, which if they turned out to be true, would cause management great problems. My guess (and it's only a guess) is that some large shareholder wants out for whatever reason (change of div to U.S. dollars?) and it's taking a while for them to unload. I'd be buying more here but I already have more STB than I should.
Sounds like the 10% is only until they have paid the missed payments: "..........then until we have paid all accrued dividends on the shares of our Series D Preferred Stock for all dividend periods up to and including the dividend payment date on which the accumulated and unpaid dividends are paid in full:"