Myanmar stopped issuing visas-on-arrival a few months back and reverted to issuing visas at the emabssy in Ottawa. A few weeks ago the emabssy was instructed to stop issuing visas pending the installation of a new computerized visa production machine. So no visas were being issued, and the date for the machine being operational kept being pushed back. Now visas are again being issued, but there is a tremendous backlog, and only people about the get on the aircraft in the very near future are being issued with visas.
Click here for Myanmar visa forms.