Version a007 quits when I click on the Data window...

Actually, you can click on the window all you want nothing happens... BUT if you click and move the mouse exactly horizontally or vertically,
this is an action that was not captured in the GUI. It sends IDL a "rectangle" with one side that is too small to output back to the screen. The NEXT version will capture this correctly. SOLUTION: don't click in the data window and move the mouse exactly vertically or horizontally... drag your mouse across the screen at an angle to create an ROI, or mouse over for data values. Sorry about that!