I’ve read your post over the past couple of days as I was having the same problem and trying to find a solution after being stuck for weeks without any solutions or replies.
I’ve finally found a solution that works for me and I hope it works for you.
Deactivate BP 1.9.1 and delete it from your WP-admin page(I am not sure if you will loose your registered users etc – I didn’t). Go to the following buddy press link
and download version 1.8.1. Install under your plugins section, activate and test to see if it works.