Hi Paul, My guess is that environment isn't set up right to find the proper grwnd.exe. The first thing I'd do would be to look for other grwnd.exe in your path. Ifeffit assumes that the one in C:\....\Ifeffit will be used. If there is more than one in your path (or to make darn sure that one gets used), you may need to change the PATH in the batch files. This sounds to me like it is entirely an ifeffit problem, not an athena problem, so I'd start looking at and running ifeffit.bat (Ifeffit Shell), and use the command 'testplot' as the test. This should show a sample plot or spew messages if it's not working properly. Start with editing the PATH in ifeffit.bat from SET PATH=%PATH%;%IFEFFIT_DIR% to SET PATH=%IFEFFIT_DIR%;%PATH% Also check in the ifeffit.bat file that PGPLOT_DEV is set to /GW. Hope that helps, --Matt