Nice that you found the causer!
Cropping the image is fine for now. Good would be if the window gets x/y sliders or something similar to move the clipping image IMO.
The "problem" with @ in email addresses is mentioned in the guide. I think that can be ignored. GuideCheck reported here "Line: 223" "Unknown command: 1". Options used: NodeNameCheck and HTDS but get it also without them.