My first guess is that it's not a bug but a limitation in the code that you have exceeded somehow (too tall, too short, etc.). What are your settings? A screen shot might be helpful.
Erich
AC 19 6006 & AC 20
Mac OS 10.11.5
15" Retina MacBook Pro 2.6
27" iMac Retina 5K
I can get this when the Marker Height is too large. Go to Window Settings > Dimension Marker > Marker Height (under the Font Size) and reduce the size.