Why is my .H264 rendered video playing in IE with darker colours?

Question

I have created a video using black text on a white background. When I use Media Encoder to export as a mp4 file, the finished video always plays in Internet Explorer with a grey (instead of white) background. My graphics card is ATI. My colleague tried it on his computer and it played with a white background as intended. His graphic card is NVIDIA.
Under 'Project settings' in After Effects, I set the working space colour settings to: sRGB IEC61966-2.1. I read that you cannot choose colour output in Media Encoder so I put a 'Color Profile Converter' effect to my layers with the output profile set to sRGB IEC61966-2.1.
After rendering out as a lossless avi and then using ME to create a mp4, the video plays back in IE with a grey background. Most confusing... and I am wondering what I am doing wrong as I found a mp4 video that plays with a white background here: http://media.w3.org/2010/05/video/movie_300.mp4
Any help is greatly appreciated.

Answer 1

Hi Rick, I have turned off colour management and the video still plays with a noticeably grey background.
In the attached screenshot from Internet Explorer 11, my video is on the right, and the video I found is on the left.
In Firefox and Safari my video plays with a white background, it's just Internet Explorer that plays it with grey. Is it possible that it is Internet Explorer's problem and not my video render settings?