VERIFIED SOLUTION i
Product Feature: Dialog setup
In Portrait Dialogue, an 'Operation' can be scheduled to run in every Month, Weeks, Days, Hours and Minutes. However, scheduling an operation to run on the last day of every month does not work due to inability of Portrait Dialogue to extract the last day of a month from system date.
This has been identified as a defect in earlier releases of Portrait Dialogue.
ResolutionUPDATED: July 26, 2018
Upgrade to Portrait version 6.2 or later release.