Email subscription Screenshot Size Changed

I have been running several reports for months with no issues, these reports are for an alarm system to highlight issues and send a subscription email every hour.

It includes a screen shot of the page I need and it has been full screen since I first published and set up the subscriptions. However yesterday for some unknown reason the screenshot is now cropped. I have made no changes to the 12 different reports and yet all have now been cropped.

Any idea of any changes made to the service or how I can change them back to full screen?