Thanks for the clarification.
Please confirm: You have the interception prediction on your ND, your NAV is armed (on the FMP) and it does not intercept?
Then there would clearly be something wrong. I haven't wittnessed this at any time. Did you intercept the inbound radial on your selected HDG? Maybe you selected the wrong inbound radial (radial instead of track, 180 degrees different)?
Dani