Many of our customers have their display setting to show fonts at 125% of "normal".  That has caused an issue in the Trail Blazer application where the attribute check boxes disappear.  This was a problem within the Windows operating system that was near impossible for us to correct without breaking many other things.  Windows 10 has come along and corrected their problem.  Since Windows 10 is a FREE upgrade from Windows 7 or 8, we HIGHLY recommend you make the upgrade.  We would recommend this regardless of the font size issue.