I've had that same problem a few times. I had to bypass the print to tape function and just do it manually from the timeline. If you go to "Final Cut Pro" then select "Audio/Video settings" then select the last tab which is "A/V Devices" you can set your playback output the same as your print to video options. You've just got to be careful because you can't navigate away or no other program can disturb it or it'll stop.
Hope this makes sense and helps
Mac G5 2x2.8 GHz Quad-Core Intel Xeon
OS Version 10.6.6
Final Cut Pro Studio 2
After Effects CS4
Cinema 4d r12