@codinghorror I think I have a 100% repro.
Go to this post:
Select exactly this text - no less, no more:
Before the Fast and Furious film series wore its absurdity on its sleeve, I thought it was trying to be serious.
(ETA: if I select this exact text in this post I can repro as well.)
No less, no more. Press “Quote”. For me 100% of the time nothing happens.
Let me know if this repros for you.
(It seems like if I select a different block of text or a different part of that block of text it works - might be something weird with text at around 100 characters?)
ETA2: Repro from this post: