Is there a conflict with Virtuemart Slider Plugin and Megamenu and Virtuemart ?

Joomla! 3.4.8
VirtueMart 3.0.12
PHP Version 5.5.26

I am using System - Virtuemart Slider Plugin for the images of the products.
When it is Enabled my VM goes crazy ! I can save my changes but I have to refresh the page to see them !!!
and the Megamenu from T3 Framework template it stops working.

Also I have this message at Position & Responsive Configuration

"The layout cannot be loaded. There might be some errors in the layout file."


I have to disable the plugin to fix what I want in the template and in megamenu and then enable it again.

Please help

Is there a better way to fix it ?