Hi Chris,
I can copy and paste without issue, so it looks like this might be a problem on your end. A few questions:
What field are you trying to paste it into? I've tested and it appears to work with the free-text fields I used, but there might be exceptions.
Are you pasting content into a field that accepts all the characters in the string? I tried pasting letters into an integer field, and nothing happened, so it can look like the pasting just failed.
Does copying and pasting between other, non-S123 apps work fine? It could be a quirk of your own setup, or (as I've had happen many times) your Ctrl-C 'didn't take' for whatever reason.
And I doubt it matters, but could I ask your operating system? I assume you're using some form of Windows, but I want to be sure.