The details are over at exgay watch.  This is the statement from CTV:

I assure you that had CTV known the content of the ad, it would not have gone to air. It is our corporate policy not to air advocacy ads of this nature. Moreover, CTV television stations do not condone, promote or engage in discrimination against anyone based on race, national or ethnic origin, colour, religion, age, sex, sexual orientation, marital status or physical or mental disability. We have a proud history of promoting diversity and building bridges of understanding between cultures both within our company and the communities in which we operate.

Commercials are vetted by Telecaster, a company that checks all TV advertising in Canada. Does anyone know anything about Life Productions?  That link goes straight to the ad.

Does this company run commercials on The Miracle Channel or CTS?
Telecaster rated this ad mature. ( requiring it to run after 9 pm) 

This ex-gay commercial ran March 3rd on the a CTV regional outlet for northern Ontario, MCTV Sudbury.
Apparently Telecaster did their job, rated it, provided relevant information and someone in Sudbury didn’t see it.  The full explanation from corporate CTV is below the fold.

Someone in Sudbury goofed, it happens, viewers complained and apparently the ad was not run again. That’s how it’s supposed to work.  I’ve written MCTV Sudbury and asked for information on LifeProductions. 

The webpage is owned by a guy in Sault Ste. Marie Ontario. I think I’ll write him too.

lifeproductions.ca                               
Renewal-Date:   2008/09/23                                       
Date-Approved:  2003/09/23                                       
Date-Modified:  2005/10/06                                       
Organization:   Jason Johns                                      

Dear Dr. Dickinson,

I am writing further to the email you received below from our CTV Sudbury station, which was in response to your concerns about an ad for Life Productions that aired recently on CTV Sudbury. This advertisement ran in error on our station and we apologize for any intended offence we may have caused.

The Life Productions ad, “Exchanged,” was submitted to the Telecaster Services (Telecaster) of TVB (Television Bureau) for approval. Telecaster was formed in 1973 by private broadcasters as a voluntary, self-governing, commercial, infomercial and public service announcement (PSA) clearance committee. The primary function of Telecaster is to review each advertising message or announcement to make certain that it complies with the Telecaster Guidelines (which may be found on their website at http://www.tvb.ca/telecaster.htm).

Telecaster screens ads for all member stations—including CTV, CanWest and all other private Canadian broadcasters–and then releases them with Telecaster approval numbers and various ‘flags,’ when applicable. If an ad receives an approval number without a ‘flag’, the broadcaster knows the ad is cleared to air without restrictions; the ad may then be telecast at the broadcaster’s discretion. If an ad contains any material that Telecaster believes could potentially be problematic vis a vis the Canadian Code of Advertising Standards and their own guidelines, they flag the ad, provide information and make special scheduling recommendations such as “mature” or “post 9 pm”, so that broadcasters can screen the ad to determine suitability for their respective stations. (For more information about Telecaster or Advertising Standards Canada, visit their respective websites at http://www.tvb.ca and http://www.adstandards.ca.)

In the case of the Life Productions ad in question, Telecaster rated the ad with a scheduling restriction of “mature,” and provided additional information indicating the nature of the spot. Unfortunately, as a result of human error on the part of our station, CTV Sudbury did not see this information. As a result, CTV Sudbury scheduled the ad without knowing that it contained problematic material that is inappropriate and unacceptable for our stations. The ad went to air, and consequently we received some complaints. Station personnel then reviewed the ad, deemed it inappropriate for telecast and immediately pulled it off the air.

I assure you that had CTV known the content of the ad, it would not have gone to air. It is our corporate policy not to air advocacy ads of this nature. Moreover, CTV television stations do not condone, promote or engage in discrimination against anyone based on race, national or ethnic origin, colour, religion, age, sex, sexual orientation, marital status or physical or mental disability. We have a proud history of promoting diversity and building bridges of understanding between cultures both within our company and the communities in which we operate.

Again, we apologize for this regrettable error, and for any unintended offence we may have caused by accidentally airing this ad.

Sincerely,

Sarah Crawford
Vice-President Public Affairs
CTVglobemedia