Problems with Tooltips & Term Pages since 2.6 upgrade

Using CM Tooltip Glossary (free) on WordPress 3.8.1 using Responsive Pro (child theme); other plugins include Testimonials by Aihrus, Visual Form Builder, Responsive Image Maps, Page Links To (and several others, but I don’t *think* any likely to cause problems):

Since I applied the 2.6.x update (I jumped from a late 2.5.x to 2.6.2), I’ve not been able to get the plugin to work correctly. It took me quite a long time to get the index page working properly. What remains broken is:
1) the hover tooltips tend to persist, and follow the mouse pointer around the window, only disappearing correctly if the mouse is moved off them then paused for a moment. Once they persist, they are very difficult to get rid of, not responding to <esc> or clicking in whitespace;
2) the Term Pages don’t work, I get a 404 every time.

I’ve been fighting this for several hours and it’s driving me nuts! I hope I’ve done something stupid & easy to spot…

Here’s a page with some glossary links on it:
http://transitionexpertise.com/the-research/research-summary-findings/

BTW:
– I’m experiencing exactly the sme issues in Firefox 27.0.1 (Mac) and Safari 6.1.1
– I have tried clearing browser caches and restarting them. I’m not using a cache plugin in WordPress
– I have tried commenting out the tooltip styling in my child theme, but it still does the same thing

Any ideas? And presumably if I want to go back to the old version (which was working beautifully), I’ll have to restore my whole site and re-do all the other plug-in and theme updates I just ran?!

Many thanks!

https://wordpress.org/plugins/enhanced-tooltipglossary/