Must be something about your system

, 'cos I do it all the time.
Copying from a web page can be tricky, sometimes, so you could try clicking 'edit' for the post you want to copy from, then copying from inside the text box; behaviour is more like a text-editor that way.
------------------
Damned if you do, and damned if you don't; can anybody cache a damned cheque?
"The e-mail of the specious is deadlier than their mail" - Tom Holt, 'Snow White and the Seven Samurai'