anotheoldgit, now that user names are links, you have to start and finish highlighting outside the link area (i.e. a bit wider than you normally would) in order to copy. If the cursor is a hand when you click / let go, then you'll go to their user profile. Drag a bit wider so that the hand disappears (but the highlight remains), and you'll be able to copy as before.
is this an advice website or just another place for some meanies to be sarcy.
4 fox sake, is it really all that difficult for some to give clear useful answers without the sarcasm?