[CS4] Editing Flash Frame Labels

I upgraded to CS4 a while back and one thing have been really bothing me.. I use Frame Labels a lot but when I click on the text box to edit the frame label, more often the not, the current label is automatically removed so I have to retype the whole label again if I only want a minor edit or anything.

IF I click on the label, then click off and undo, when the Label returns, I can click on it and edit it with no problems at all. It's a minor issue but annoying.

Oh, by the way, This is Flash CS4 Professional running on Windows 8.1