I found why it didn't work Rated 4 out of 5 stars
I finally knows why it didn't work.
when I installed add-ons which use right mouse drag to scroll(like scrollbar anywhere or grab and drag etc.), suddenly it stops working.
It didn't happen before(even I installed both add-ons) but it suddenly happened. I don't know why.
P.S Thanks you for updating.
Thanks for updating. Rated 5 out of 5 stars
Thank you for updating.This review is for a previous version of the add-on (2011.03.24).