This started happening in the last 1 to 2 days.
When smashing Ctrl+V on at least Windows 7, the text on the clipboard does not get pasted into the TextBox. This does only seem to happen with custom TextBoxes, the default chat one still seems to react to pasting.
Repro: In an empty place, just add a ScreenGui with a TextBox inside of it, then in Play Solo try to paste into it and see it fail. Also happens online.
got the same problem, Windows 10.
Have you tried lightly pressing Ctrl+V?
Receiving this issue too, on Mac.
I’ll investigate into this and report back, thanks!
Wait, hasn’t it always been like this? I never recall this working.
It’s never worked on Mac 
I seem to be able to paste text on my windows machine using ctrl+v, what keyboard layout do you use? Is this now fixed for you?
I’m able to paste text into the chatbar on the client, but using Studio (0.260.0.85956) when I paste into the chatbar nothing happens.
Still happens for me, using a standard querty keyboard. Pasting does work in the chat gui + dev console apparently (maybe anything CoreGui works?), but any custom ones still fail.
I’ve been able to fix this with a re-install. It seems to happen at random, where re-installing fixes it.