Hummingbird problems breaking JS and some css and functionality

Marc contacted us by email am opening a ticket on his behalf

I have had a small issue where I used Hummingbird on a site and some of the colours changed or menus stopped working so I guess I need to try turning some JS functions on and off? One other thing - this site uses W3 Total Cache and MacCDN content delivery network so do I need to worry about these types of things conflicting at all?

I am still a bit confused and I've tried a few things - would you be ok with me giving you access to the site in question to take a look at how you can tweak so I can use this as a sort of example to refer back to for the future?? If so I can create you an admin login and send it over?