Not sure what's changed your end or mine, but I can't get plogs to print (in any size paper except a4 portrait ) from my iPad  (air 2 - latest IOS).  Historically the process has never been smooth but now selecting print seems to wait an age before finding my air printer (other iOS apps find it straight away). Selecting half page a5 again waits an age before I  then press print. no confirmation dialogue box comes up and my printer just spews out a blank page (yes there is ink in it!!  :-)

On a couple of occasions, pressing select printer has caused the app to crash. 

I have to resort to doing  a IOS screen copy and "sharing" that to my air printer via a photo app....which then takes ages to print as it is effectively at that point printing a photo.  Either that or save my route, logon onto a PC and then print the plog from there (not always possible)

Of course I have tried rebooting everything. Still no joy.