The limit on the signature picture was 400 x 100 pixels its now been extended to 600 x 120px. As some of our pictures were automatically re sized in height to fit within 100pixels, which then scaled the width proportionally, so we ended up with a small signature picture.
You will need to re upload your signature picture if you want it to appear bigger.
You will need to re upload your signature picture if you want it to appear bigger.