I'm getting this DB error: WordPress database error: [Unknown column 'staffmembers' in 'where clause']
AND p.post_type IN (staffmembers) AND
I simply went into line 190 in the plugin and added single quotes to the query -
AND p.post_type IN ('$post_type') AND
This seems to have fixed the problem. If other people are having post type problems, this is probably why.