I am struggling today with what looks like some fundamental misunderstandings about using ILD sav files. I'm working on some legacy code where the desired end product is a sav file IDL 'executable'. There are some things that need to be changed in this project, and I want ro run the project right from the IDL project, vs. runnin the sav file - but I can't. I can a newly compiled and generated sav file just fine, but if I left click on the project itself in the workbench, it does not run, and I get a 'class not found' error (the project interfaces with some Java code). But the sav does not complain. Why / how is that? Also, one reason I am trying to run the project without using the sav file, is that I cannot seem to print output from the projects' procedures to the console, running the sav file. Is that correct? thank you to anyone who can shed some light on this.