Are you on Vista? Because I'm not sure it's compatible then.
Assuming that the vid playes OK in WMP?
Otherwise when what you describe happens, it's usually a codecproblem.
This post might help.
https://www.forumophilia.com/topic11375.html
Once you get a good play with ImGr.
In MMs thread you should have the info on how to catch images.
For settings to save grabs see the attached pic.
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[URL=http://www.casimages.com][/URL]