On PC / Laptop it’s even easier. Just go to the address bar, mark everything and press CtrlC (or right click and choose copy from the context menu).
Paste into the forum then 
Yes, that’s what I was doing… how I’ve always copied/pasted. Strange!
I love technology… not 
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And it used to work and suddenly stopped? Or never worked for you here on Postcrossing?
What browser are you using? Have you recently switched browsers or got an update?
But there still might be a workaround. When pasting don’t use your usual way but trying to paste without formats:
or (if you have function keys)
ctrl+fn+v
Maybe that works? The link you posted above was formatted, not plain text… so it might help.
I’ve only experienced it on Postcrossing. Probably just an outdated system. I’ve been putting off getting a new PC so looks like I’ll be laptop shopping soon!