Blue symbol in mins/secs in editing??
 

I use Pro Tools LE 9 every day for recording and editing voice overs on my Mac 10.5.8. Today there's a blue symbol in the mins/secs and bars/beats header above the recording box that is controlling the editing. I can't figure out what I must have clicked on for it to appear and I can't edit unless I get rid of this.

Anyone know what did and how to undo it?

Thank you,
Mary