I just tried it and on windows it works using ctrl+v. So I am not sure why you have that issue.
I had this issue with Adding Adresses to Adressbook from the beginnen. Somehow cmd + v is not accepted in "[color=rgb(68, 68, 68)][font=roboto]Account's Private Key" [/font][color=rgb(68, 68, 68)][font=roboto]Field the other Fields work as expect (e.g. "Label").[/font]
[color=rgb(68, 68, 68)][font=roboto]If I define a short cut "ctrl + v" for paste it works in "Acc Priv Key" field, but this is now real solution under OS X.[/font]
[color=#444444][font=roboto]So maybe the NCC dev could look into it.[/font]
[color=#444444][font=roboto]BTW who is responsible for NCC ?[/font]
FireF
[color=rgb(68, 68, 68)][font=roboto]cmd key is also know as "Apple Key"[/font]