Sadly I too cannot print the flight plan maps from Plan_G.
When I go to File - Print - Print Flight Plan, the FP appears in the right hand pane, the print icons work and printing out works fine.
When I go to File - Print - Print Current Map, the blue Title Bar disappears and can see map under the 'Print pane', there is no map in the right hand pane, and when I go to the Print icon and proceed all I get is a blank sheet (as that is what is in the right hand pane presumably). See attached JPG.
If I use the Print icon from the Quick Access toolbar, I get a print but there is no control over the size of the print - all I get is a print that fills about two-thirds of an A4 sheet! I want it to fill an A4!
There is a temp.xps file but I do not want to print this file out all the time as again I cannot control the print appearance.

Windows 7 64-bit with HP B109 printer - no other problems with printing.

Using Plan-G3 (v3.0.1.50) on Windows 7 64-bit.

When I print out the flight plan maps I can only get them to print out to images that are 21x14cm on my A4 sheets. It makes no difference whether I set my printer to Portrait or Landscape.
Is there a way to get them to print out to cover an A4 sheet?

Otherwise I think I am getting the hang of this very interesting bit of kit. Thanks.