Pasting into TCMD via right-click menu?

(From another recent thread), I copied the command from the forum and pasted it into a console ...
... and pasted it again. Then I started TCMD and tried to paste the command. "Paste" is available on a tab's right-click menu, but when I choose it, I either get nothing, or ...
I tried again, this time copying the command from the console ... same thing, either nothing or just SCRPU. The same is true pasting any text into a TCMD tab. I either get nothing or only the first few letters of the text.

If I use Ctrl-V, all the text pastes. If I use Edit\Paste, I get the undesirable behavior described above.