Check boxes that normally appear in places such as the Control Sets dialog, are not appearing and the cell is blank:
This issue has been known to occur on computers which have a different font such that the height of the rows in tables is less than the default. When the row height is too small, the check boxes are not visible.
To resolve this, click the horizontal line between the rows on the left side of the table, then drag to make it taller and release - this should make the rows taller and the check boxes should be visible.
A future version may have improvements to prevent this from occurring: reference #393140