Happens on multiplayer, haven't tried singleplayer (nor do I care to, why would I share links to myself?).

Hyperlinking doesn't work in chat. You cannot click links you or others send. Doesn't matter if you have prompt to open, copy to clipboard/whatever else on, it just doesn't work.

Worked fine in 1.5.1 and 1.5.2. This issue has existed since 1.6.1, which started out as links sometimes not working due to them being sent while you had chat open via / or enter (or whatever hotkey you had it set to). In 1.6.2, it seemed to misplace the location of the hyperlink in the chat, making it impossible to click the link unless it was sent twice (places actual link below chatbox?). Can't confirm the last bit, just a theory..

Anyway, it's 100% broken in all snapshots/prereleases for 1.7, as well as 1.7.2 full release.