HI Scary,
I may be wrong, but since I've joined POET in 2012, I've not witnessed any halt of trading.
There is only one halt reported and it was indeed in 2011
As per the 20-F filling:
Trading of the Company’s shares was halted on February 25, 2011, and resumed on March 2, 2011, in connection with the Company’s announcement of the receipt by it of an evaluation report on the potential business and economic value of the POET platform. After the disclosure and documentation of the report, the suspension was lifted by the TSXV.
Feel free to tell me if I'm mistaken
Regards,