Hi there Tim - apologies for the substantial delay in getting back to, have had the flu for the past couple of weeks and only just getting back in to things!
In answer to your requests, here is the screenshot of the prefs panel from After FX
And from Premiere -
Tried alternating After Effects / OS locations as you suggest but still has the same results. The Panasonic is a 720p monitor. Appreciate the settings are set for a 1080 destination and you could understandably think this may have something to do with the fault in both respects except a) you don't seem to be able to change this and b) again, seems to work just fine in Premiere.
Look forward to your thoughts
Many thanks
Zen