I've tried disabling and re-enabling it, but it will not work, at least not on mkv files. Maybe the Haali Media Splitter is required for that?
try showing a tooltip of another file in the same folder (if you don't have any, you will need to create a "test.txt" file), and then the mkv tooltip
I am getting this problem I am not getting the media info when moving the mouse over even a different file first then the mkv file. I have made sure the option is check in preferences...
Please let me know if there is a registry setting I need to check for or something else that can fix this.