[ct-user] Corrupting BIN file

[Endorf Family]

Running CTDOS V 10.02.003

After finishing the ARRL CW DX contest, I ran:
CT_Time "logname" -1
to subtract one minute from the log. (Yes I really don't need to do this),
but after completion, when I try to launch CT with that bin file, I get a
message saying: "Invalid partial S5*Y" and then it boots right back to the
DOS prompt. The actual displayed symbol in the message is not an asterisk,
but looks like a ASCII checkmark symbol.

It's repeatable, but thank goodness I have the .OLD file to send in.
Am I doing something wrong here?

WA0MHJ