Btw, I am using Elgg 1.6.1

Anna,

the users listings should work in the free version, you may have some issue with your views... The full version is updated more often and all the issues you're having (and a few more) are taken care of in the full version. In case you find a bug in a paid version, it will be removed free of charge. I will be able to debug the plugin straight on your site then if needed.

i hope for the next release, everything is in 1 plugin. Much friendly user.