Hi i was able to replicate the issue on 1.6.0.9.
I had to turn off the line of code that loads the 'membership' page in the seller summary to get the superfish menus (default bootstrap theme) to work.
eg. /modules/agilemultipleseller/js/sellersummary.js line 13
" if (membership_module_integrated > 0) get_my_membership_info(); "
After turning the loading off, superfish menu works right away.
Please advise.