trash character inserted into send string

pmcd — Fri, 11 Apr 2008 18:25:46 -0500

I had 80 lines of tcl expect scripting running great, which basically opened a plink command to a remote switch and ran CLI commands, and then I started getting random "?" interspersed in my send strings
my command:
send "add uplinkport 123_45_678\r"
but what would be entered on the remote system
add uplinkport 123_?45_678

I can cut the string from the script, and paste it into a putty terminal session, and it executes fine, no "?" appears

I tried executing older saved known-good version of th script, same behavior. Tried those scripts from another PC, same. Rewrote using notepad, wordpad, editpad pro, same behavior. Tried running scripts against a different switch, same behavior. Used norton av scan and unhackme, nothing found.

What is causing this "?" to appear in my send string???

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trash character inserted into send string