RESOLVED

All my PC's and notebooks had one thing in common. They all ran a PDF printer driver called PDF-XChange Printer Lite v6. So... I went and installed a later version from Tracker systems. After rebooting... and setting the margins properly, suddenly Glideplan "Set Print Area" function works properly. Deleted the older driver.

There must have been some strange interaction... or something got corrupted..

All is well..

Walt Rogers WX