When qtip2 is used with jQuery 3.0.0 (released just a couple weeks ago), the jQuery Migrate script warns about the use of the .bind() function, which has been deprecated. The message I get in the console is this:
JQMIGRATE: jQuery.fn.bind() is deprecated
The recommendation is to use the .on() function instead of the .bind() function.
This also applies to the usage of the .unbind() function, which is recommended to be replaced with the .off() function.