I have missed your reply, sorry for our late answer.
MegaMenu did not work with our webstore that use NopCommerce 3.30 and furniture theme 3.30 Internet Explorer was the browser we could not get the Nop Mega Menu to work with, we had to uninstall the plug in for now, I come back soon when I have time to activate the plug in so you can see the problem with IE.
I like the Nop Mega Menu plugin and want it to work perfect with our webstore, we have installed Nop Quick Tabs and Nop Attachments and it work fine no problems so far.
I am returning here with a new reply soon!
MegaMenu do not work well with IE8 we have also seen that it is problems with new versions of IE
we are using NopCommerce and Furniture Theme 3.30
Thank you for all help to solve this problem!
What exactly is not working with the Mega Menu in IE8 and the theme you are using?
Can you send us a link, so that we can take a look and advice?
p.s: You have also send us an email about this but it is better to reply here as the others can see it if they have a similar problem.