#1 If you're using a Mac with Mavericks, disable your system's "Dictation & Speech Recognition" features.
#2 Validate code and fix reported errors.
CSS - http://jigsaw.w3.org/css-validator/
HTML - http://validator.w3.org/
#3 When DW starts acting weird for no other reason, the first thing to try is Deleting Corrupted Cache in DW
http://forums.adobe.com/thread/494811
#4 If that doesn't help, try Restore Preferences
http://helpx.adobe.com/dreamweaver/kb/restore-preferences-dreamweaver-cs4-cs5.html
Nancy O.