You were right. It was my browser settings that did not allow me to post to the forum. This is very odd because I'm the only one who uses my work station, and I haven't changed anything in my browser settings. Also, I do my online banking from here and also never had problems there either...
Even stranger is that I think you can return the browser security level back to its former settings and still post to the forum. It is either a glitch in the Snitz forum we use, or it may also be associated with the constant stream of on-line upgrades Microsft pushes out to patch security holes in Windows.