Hi RJH!
Welcome to posting on MobileRead!
You are not the first to have odd blanks in the Reader screen. Here is a thread that might help:
https://www.mobileread.com/forums/sho...d.php?t=153732.
This thread has more general tips for improving writing in Ermine:
https://www.mobileread.com/forums/sho...=e-ink+writing
Good luck!