Welcome to the wonders of ACE/Gr.. This program seems to enjoy a VERY large stack for some big datasets. It turned out to be neccessary with a stack of 1mb to run some of the example files! But you may get away with less for simpler ones. Your workbench should also be large 640x400 is probably a minimum. These files are the documentation/examples files to xmgr, you'll also need the binary distribution xmgr1.lha. TP