I would think that the new version that corrects the subtitle issue is available since 2014.
I found that when I was looking for an alternative to Bell for Netflix viewing. One of them is a Sony Blue Ray player. They even have a Netflix button on the remote control.
I was unsure about the subtitle issue, so I asked on Amazon the question and got a reply from a Sony representative. Here it is:
The given links gave me the information on different versions of Netflix firmware and on how they deal with subtitles.
So, I wonder if Bell Fibe has constrains that forbids them to install the newer firmware (again, available since 2014) or carelessly installed a previous version of the Netflix firmware.