No recommendations being saved and so none displayed

I have installed this module and the votingAPR but I still not getting any recommendations coming through.

I have looked in the cre_similarity_matrix table and it is empty.
I have a few test article and a few test users, the users have viewed the articles.

Yet still no recommendations.

/recommendations
shows...
There currently are no recommendations for you

and

/admin/cre/comment
show...
Currently there are no settings to be made to comment recommendation module

Any ideas?

I have tried tracing through the code to see if I can find how the module adds the data into the table, I found the following functions that seem to insert into the matrix table but these don't seem to be getting called.

cre_modify_avg_difference
cre_votingapi_insert

Any help would be greatly appreciated.

Thank you