OPERATOR-Attribute doesn't work?

Hey,

I’m trying to manage downloads in different categories. When I try to include files to the site I get ALL files or no file displayed.

Tested the attributes and when there is no “operator” (or operator=0, operator=””) then all files will be displayed. If I try f.e. operator EXISTS or IN nothing is shown. Also when I try id=”45,47″ operator=”IN” nothing is shown. Access in Categories are set to all users.

This is the code I tried:
[wpdm_category id="45" operator=0 title="Busfahrpläne / RVHI" desc="Busfahrpläne / RVHI" template="link-template-default-ext" toolbar="0" cols="2" colspad="1" colsphone="1" paging="0" order_by="field name" order="ASC" items_per_page="10"]

(had also used name of category as id to test – same result, nothing shown; my categories are attached as screenshot)

What wents wrong? I’ve no ideas yet and are happy with every idea.

Best regards
Andreas