I am having the same problem with faqslider and rt_crystalline. I have tried the installed version of mootools, plus the update to 1.2.5. It works fine in an akiraka site. I also installed and tested another faq plugin from core design and same symptoms. The second faq plugin breaking seems to implicate the template. Firebug shows no js errors.
The affected page is
www.easyearnedincome.com/FAQ/
More Info. I have discovered that VM tooltips no longer work. Note all this stuff worked fine before changing template from akiraka to crystalline. Note I set on the mootools upgrade (1.2.5) plugin which fixes a https problem (go figger) and in any case it doesn't make any difference if the earlier mootools version is used or not.
For troubleshooting, could you please disable the Gantry Cache and GZipper first?