Hi All, I am frequently in the situation of editing code while running a GUI program. For example, I may edit the function that handles the results of an event, recompile, test, etc. What I find is that if I make any error that gets caught by the compiler, the idlde hangs for a _LONG_ time. I can continue typing in the editor, I can recall all the history commands in the console, but I can't actually do anything until IDL eventually finishes thinking. The fastest way to get back to coding is to kill the idlde process from the task manger. I have observed this on Windows, but I haven't tried it on other platforms. Has anyone else seen similar behavior? Is there something I can do to escape short of killing the idlde process??? Thanks! -Larry