plugins often conflict with each other. In such cases I try to determine after what exact line in plugin B, methods from plugin A become unavailable (by using console.log(jQuery.methodFromPluginA) - when it will print undefined, it means that method become
unavailable) and check different versions of plugin. Sometimes older versions work don't conflict. Also it can be so that you can't use these 2 plugins on the same page (like jquery ui and jquery tools for example).