Middleman since: April 13th, 2011
Marketplace minion since: April 18th, 2011
Runescape minion since: June 6th, 2011
Moderator since: September 28th, 2011
General Moderator since: November 2nd, 2011
Global Moderator since: April 29th, 2012
Super User since: November 1st, 2013
I don't know what the particular problem could be, what if you 'reset them to the default settings', and then try to change your options again?
Resetting to default allows text to be seen but, I hate having to select my font and color every time I post something. When i chose my font and color (Comic San MS and Magenta) I cant see txt in any "Message:" box, even PMs.