The best labeling software I have found is Discus Labeler. https://www.magicmouse.com
I have tried dozens and this is slicker than snot…
It has layouts for most printers and labels, including the R200 and Premira Bravo which is a very slick automatic printer that does one offs just fine.
Try deleting Pro’s Preference file…hold down the Shift and CTRL keys while launching Pro, then reset your preferences. Failing that, I would try another firewire cable and camera.
Disconnect any other firewire devices. Camera in VTR mode? Is DV-IN enabled in cameras menu?
Can you play Pro’s timeline out to your camera with audio? If yes, just initiate recoding manually from the camera.