Catman, your spoiler doesn't work with the settings you show in your image for your spoiler tag, Page Fonts and Colors would have to be unchecked under User as well.
What is shown does work for MsLedd's spoiler tag(the current one).
BTW, without HTML enabled we wouldn't have been able to use your temporary spoiler tags. Moderators and Admins have HTML enabled but regular members in most of the forums here do not.