Black artifacts appear on rulers
When opening an older ID document and working on it, moving the mouse pointer around leaves black artifacts on the rulers, top and left. It also distorts the 0 point of the ruler in the upper left corner.
A quick zoom and return to 100% size will clear it, but with use, the rulers will accumulate black marks again.
This bug has persisted in many previous versions of ID, and is alive and well in v15 (2020).
I hope you can fix this quickly.