Matinee not playing track in play mode

I have two actors in my scene of which their materials are being animated in Matinee, with material float parameter track.

The material parameter is a “DissolveAmount” which makes the actor go from invisible to visible.
In Matinee the animation plays perfectly, but when i start play mode, the group/track “Product01_Roof” is refusing to play.

This is my Matinee Track:
http://puu.sh/zvZAN/5b846c2e22.png

Note that the group/track of “Product01_Room” is playing perfectly, the only difference are the key frames, mesh and that it doesn’t have a camera icon on it’s group displayed.

Does anyone know why one mesh refuses to play?