I’ll send you a screen shot if you send me your public email address (see my note to you). ${project_loc} is a variable that is exported by the IDE. It used to be sticky in the last release so that it remained set until you clicked into a different project context. You could use it like this to configure a build script for example:
${project_loc}//build.xml
Now, you get a popup window every time you happen to change out of the current project context and try to launch something.