Gnome do opens shell script in gedit (intermittently)

I have a shell script to start intellij idea.

~$ cat /usr/bin/idea
#!/bin/bash
/usr/local/idea/bin/idea.sh

~$ ls -al /usr/bin/idea
-rwxr-xr-x 1 root root 40 2011-01-22 11:18 /usr/bin/idea

Running the shell script on the command line starts idea. Typing idea in gnome-do SOMETIMES opens the shell script in gedit, and SOMETIMES actually runs idea. I have no idea what the difference is.

For what it's worth, I used to have /usr/bin/idea as a symlink pointing directly at the idea.sh startup script. Gnome do yielded the same behaviour.

/usr/bin is in the Files and Folders plugin path.