I have just run a test with WP 4.7.1 and MyStyle 1.6.1 and it works OK for me.
Do you have Flash installed on your computer? If not, HTML5 will show automatically.
There is a checkbox in your plugin settings for HTML5 only, make sure that is NOT checked if you want the Flash version to auto play.
Please make sure you have version 1.6.1 of the mystyle plugin, there was a bug in version 1.6.0 that was fixed soon after release, and that fix starts in 1.6.1
Can you paste your WooCommerce system diagnostic here?
Are there any error messages you can copy from the page or from the console?
Here’s more info on the 1.6.1 bugfix: