I am the author of pForth.
I cannot access the attachment from the URL in message #5. But in comment
#10, Albert says the program starts with a @ command. I agree with Albert
that pForth is expected to randomly crash in that case. Such a program
essentially grabs an undefined address from an underflowing stack and tries
to read from that address. That may or may not crash, depending on the
PForth is a typical programming language that allows a developer to write
incorrect code that can crash.
I believe this bug should be closed as "Working As Intended".