Attached Link: http://market.renderosity.com/mod/forumpro/showthread.php?thread_id=2642265

Copy the below line and paste it into your style box (My Options). 

a.forum_threadname_link:visited, a.forum_threadname_link:active { font-size:12px; color:#FFFFFF; }

Then change the "FFFFFF" to the hexidecimal value of the color you want. I used '808080' for grey.  Works perfectly.

See Calyxa's post in the linked thread for a link to color hex values.