loop-post-navigation-links plugin

hi i am using loop-post-navigation-links plugin to navigate those post which are in the same category in the single page. It is working for the senario

post1, post 2,post3 are under category1

It is not working properly when senario is like below :

post1 is under category1 and category2

or if one post is under multiple category then for those category post it is not working when i want next previous work only under same(1) category post

The function the plugin which I used next previous is

next_or_loop_post_link( $format=’%link »’, $link=’%title’, $in_same_cat = true, $excluded_categories = ’12’ )
and
previous_or_loop_post_link( $format=’« %link’, $link=’%title’, $in_same_cat = true, $excluded_categories = ’12’ )

Please help me some body