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We have a program that crashes from time to time. The error message says "Unknown Error, save your document under a different name before proceeding: in draw". This happens randomly in a frequency of about once every few days. The error is probably related to some of the objects under in the panel "MFC 1", "MFC 2"... or the sequences related to them. If we remove these objects and sequences, the program can work for weeks without any problem. The objects and sequences under "MFC X" panels basically send a string with a RS232 serial port, parse the string that is returned, and then show the results on the panel. The ctl file is attached. New GMP V1.1.ctl Would you please provide some idea on improving the stability of the program? Many thanks!