FEE ajax loading hangs

Hi, Scribu! There are two problems on my website:

(1) FEE ajax loading hangs until page reloaded. Of course, I can’t edit via plugin.
I’m using wpmu website with html5 doctype, buddypress default theme, wp minify (fee and aloha scripts excluded), wp super cache (don’t cache for known users), jquery.min v. 1.4.2. Wp_head, wp_footer exist.

(2) Instead of normal title the plugin shows something like this:
<span data-type=”input” data-term_id=”7″ data-taxonomy=”category” class=”fee-field fee-filter-single_cat_title”>Category title</span>

Any ideas what’s wrong? Thanks for your support.
Hovewer your plugin is great!