They seem to print fine for me from LCR (using the Chrome browser currently). My calling is ward clerk.
I can access the Ministering Assignments page and click the print button in the upper right corner - a tab opens with the report as a .pdf file ready to print.
I can access the Ministering Elders or Ministering Sisters page and click the print button in the right corner, select the options I want, and a tab opens with the report as a .pdf file ready to print.
Can you be more descriptive on what is not working and how you are trying to access it?