Cecil,
I did not pay to much attention to your program, but I saw you are using DTOC and dates, and DTOC is sensible to SET CENTURY and SET DATE, so you should make sure they match in all workstations, or better, use something that does not rely on them, like DTOS()
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges