I am trying to download my PROFIBUS PDPMV1 Master/Slave configuration from the ProSoft Configuration Builder (PCB) "PROFIBUS - PDPMV1" Online-Download Configuration menu option; and it is lo

Please do not use the "Online - Download Configuration" menu option from inside the PCB "PROFIBUS - PDPMV1" configuration window.  If you do this, it will lock up PCB, requiring you to shut it down and restart it to clear the error.

Instead, exit the "PROFIBUS -PDPMV1" configuration window, and use the "Project - Module - Download From PC to Device" option from the Main PCB window.  This should work every time without locking up PCB.