Dear Envi-ans, I wrote a batch process in ENVI+IDL to import/mosaic MODIS snow cover images (2000-2008). My batch works perfectly when I run it for seperate years, but when applied to the whole stack of years, it hangs when opening the hdf files (i.e., it opens a dialog to enter the lines/columns etc. manuanlly) after processing X files. For example: it runs perfectly for the first two years, but hangs when processsing the images of the 3rd year. However, if I run the 3rd year seperately, it works without problems. When I look at the output of my batch, I see that when it hangs it loads functions DLM: IDL_ECW and DLM: MRSID.? Does anyone has an idea why my batch hangs after a processing X (e.g., two years) and why it loads these packages? Thanks in advance!