My application uses List & Label to print reports.  I am currently using 
version 20.  I've been getting complaints from customers recently about 
weird issues related to printing - only one copy prints when they should 
be getting two, print job abruptly ends with an error, etc.  I found a 
bulletin that was put out by Combit on 08/12/2016 stating that recent 
Microsoft security updates have been causing lots of printing issues 
with List & Label.

Here is a link to the bulletin - 
https://www.combit.net/en/reporting-tool/forum/t9640/!!-printing-problems-with-list-label-since-mi/

Combit has alerted Microsoft of the issues, and Microsoft has confirmed 
it to be an problem.  They are working on a fix now.

I wanted to post some information here in case anyone was running into 
similar problems.  It's possible that uninstalling the Microsoft 
security updates referenced in the link above could help resolve the issues.