Print Merge breaking text into curves. How do I prevent this?

I've been using print merge and find that the majority of the time the text is automatically broken into curves. I always choose to open with editable text when opening the postscript file but still the text is broken or some words will be broken while other words will remain editable. Is there a way to prevent this? I do proofing which requires I change some of the merged text from time to time or another member of my team to do it and it is inconvenient when the text breaks into curves. Thanks in advance for any help!