Linux Redhat "Screen" won't detach

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http://serverfault.com – I've got a screen set up, I access it like this 'screen -r' it works fine, but when I go to put it in the background, I've previously used 'Ctrl a+d' but every time I try that now it puts '^A' in terminal instead and it won't detach :( I've tried using Coda 2 rather than terminal but I'm still getting the same issue. (HowTos)