Firstly thanks very much for your plugin. I will donate via PayPal in a moment.
I've solved my problem by rolling back to 0.8, but wanted to flag a potential issue with 0.9 (not urgent for me but you may be interested!)
I am not sure whether it's an issue with menus used in the sidebar (using the standard WordPress Custom Menu widget) or if it's a problem with using a secondary menu. What I've noticed is in my secondary menu in the sidebar the following CSS classes aren't generated on the list items:
.current-post-ancestor, .current-menu-parent, .current-post-parent
These are obviously handy if you want current categories of menu items, and current post highlighted in a sidebar menu.
Thanks & cheers,