In latest 2.10 beta (upgrade to all latest through the GUI),
CDR does not show calls in screen, but only if exported in CSV.
In the screen some empty rows appear only, with some characters in them.
We are aware of the issue and you guys should see a new cdr module soon which will aim to resolve the issue your experiencing.
Edit: I take that back, it will be a new framework that should correct this issue for you.