That's weird.
When MCS starts it populates the dropdown list with the content of the file x.DEVICES where x is either 1,2,3 or 4 depending on which version of PBP you have licensed. 4.DEVICES is for GOLD for example. The files are located in the root PBP3 directory.

Is it possible that you've manage to delete or corrupt that file? You can open them in Notepad and take a look.

You can always re-install and see of that fixes it.

/Henrik.