Edward J. Rubeo:
Thank you for your post.
I have tried a number of ways to make this fail, but I've been unsuccessful.
What is the field font? Does the data have mixed fonts? What is the font size?
The next time this occurs, instead of removing the popover, what occurs if you turn off the vertical scrollbar and go to Browse? If this works, go back into Layout Mode and add back the vertical scrollbar. Does this work?
Any other information you can provide may be helpful in replicating this issue.