With the latest update I can only print in Letter paper size. Nomatter what I pre-select (A5, A4 etc.) it reverts to Letter on the print out. All ok before update and all other programmes on the PC work fine.

We haven't changed anything about the printing. Could you confirm exactly what you're trying to print and the steps you take to print it?

Has anybody else observed this?

I have a 'stored routes'. I tried to print an A5 Pilot Log for the route. It has printed in A5 before and the settings had not been altered. It printed in Letter. I reset the  page setup to A5 but this did not take effect, it reverted to Letter with no input from me and printed in Letter.
I am doing a complete re-boot of my computer to see if this helps. Will send results of this later.

All working fine now on one trial run. Printed in A5 as I wanted. I am at a loss as to what happened as I just went through my pre-flight planning as I always do on a route I have flown before. During the start up of Sky Demon an update was offered and done. Only then did I have the problem mentioned and, at the time, ready to go out the door, I did not resolve it. After a complete reboot of my computer and router etc ALL IS NOW WORKING FINE. Ho hum back to old fashioned engineering in my shed with a pickaxe and sledge hammer that I can understand. Seriously I'm not the best with computers but do find Sky Demon so easy and intuitive that a glitch throws me - it is too good and easy to use.