It’s rather difficult to get information about the GMP.PR.B dividends!
Their historical dividend information indicates that the last dividend was paid 2012-9-30, although I feel certain that the December payment proceeded smoothly; Information regarding 12Q4 is not available; and the TMX Money site reports an ex-date of 2012-12-6.
Come on, guys! I find this poor communication irritating enough in non-financial companies; it is not acceptable for a financial firm – particularly one rated Pfd-3(low) Trend Negative – to cultivate such an air of mystery.