Assigning Textmate as the external editor, it works as expected for several projects. Double-clicking on a file name within Xcode will open it in Textmate.

Then all of a sudden, files clicked in the Xcode project menu no longer open --- instead Xcode will pop up an error message saying it cannot find the files and the "perhaps it has been moved" thing.

If I then disable Textmate as the external editor, everything will work fine again.

This does not happen if I assign BBE instead of Textmate.

Perhaps I've missed something. What am I doing wrong here?

-Shin