I suspect that the crash do to "integer memory overflow" was the result of my poor coding. I don't remember the exact wording of the error message. However, I added the following to the compiler flag "-O2 -Wl,-stack_size,0x10000000,-stack_addr,0xc0000000" and the error disappeared. Compiling in 64bit also worked. Since revising the program for other reasons, the problem has gone away. For what it's worth, the program uses Aplot, Appgraphics, embeded Aplot, and several matrix routines. I don't think it's a problem of SF 3.30; GREAT PRODUCT! Thank you.