I have Mac OS Yosemite 10.10.1 on IMac 21.5 inches, from the end of 2013, 2.7 GHz Processor, Intel Core i5. After about 10 minutes of work (any - drawing, editing) in DraftSight (latest version) me booted message: "The program must be terminated due to fulfillment of application memory." After the restart of the application, the problem appears over again. Can anybody help...?