If you look at the bottom of a thread, you will see three buttons. One says "+ Post Reply". That button, if used for a reply, lets you check/uncheck the signature box.
If you go below that row, there is the box "Quick Reply" Here you do not get a choice.
Also, the system has been changed to apply the "maximum of 400 characters" rule to our signatures (mainly because of space), per a notice from the admins a few days ago. Yours might be too long.
When you try to change it, most have found it best to copy the current one into a text file, edit it, then copy it back in, so that you don't accidentally erase the whole thing.
Post Edited (142) : 8/27/2010 7:18:59 PM (GMT-6)