I'm using InDesign CS4, and all of a sudden, I can't change the character size with the up/down arrows in the character area of the top menu bar. Even with the text selected and on the text tool, the up/down arrows to change the size are grayed out. I've quit, restarted, nothing - to no avail. This is actually a big, time-consuming and productivity issue I've never run into. Any ideas on what happened and how to fix this?