When bug fix 4417174 was fix, it was done incorrectly.
* Font used in left-hand frame lists */
/* .FrameTitleFont { font-size: 10pt; font-family: Helvetica, Arial, sans-serif } */
/* .FrameHeadingFont { font-size: 10pt; font-family: Helvetica, Arial, sans-serif } */
/* .FrameItemFont { font-size: 10pt; font-family: Helvetica, Arial, sans-serif } */

Also, please remove the two commented lines, which are no longer needed
now that the above lines are commented out:

/* Example of smaller, sans-serif font in frames */
/* .FrameItemFont { font-size: 10pt; font-family: Helvetica, Arial, sans-serif } */