Please trash your preferences and restart the computer to resolve this.

On Mac OSX:

Go to: MacHD > Users > your user name ("the house icon") > Library > Preferences. Delete the following files:
- com.digidesign.protools.plist
- DAE Prefs (entire folder)
- Digisetup.OSX
- ProTools...v7.x Preferences (this may be either ProTools LE or TDM, and any version, such as 7.1, 7.4, etc).

On Windows XP:

1. Go to: My Computer > C: > Documents and Settings > (your user name) > Application Data* > Digidesign. Delete the file entitled "ProTools...v6.x Preferences.PTP" (this may be either ProTools LE or TDM, and any version, such as 6.4 or 6.9).
*If the Application Data folder is not there, go to: Tools (in the menus at the top) > Folder Options > View, and select "Show Hidden Files and Folders."
2. Go to: My Computer > C: > Program Files > Common Files > Digidesign > DAE. Delete the entire "DAE Prefs folder."

Empty the Recycle Bin/Trash after trashing preferences.