I went to the layout setting and changed the Printing margins to .5 inches each and the problem went away.
After a couple of months of "fixes" like that, I've learned to count on this coming up again with different combinations of text.
When you change the margins (or add spaces between fields, or adjust the sliding, or make the fields wider/narrower, or any number of other things like this that I've tried) you change where lines start and end, both horizontally and vertically, so chances are you'll coincidentally "fix" it. A few more reports go out, and then you find the combination of characters that breaks it again.
Bottom line, there's no good reason for a line to repeat on the printout unless the data repeats. (I will say this is better than the bug that was in 10 where a line would be skipped... same client.)
I need to know how to properly report this as a bug and hopefully get it fixed. Producing narrative, deliverable reports is a key aspect of this client's business, and if we can't fix this in a reasonable timeframe we need to consider either rolling back to FM12 or redisigning with a 3rd party plugin or app handling the printing.
I feel your pain. I also specialize in printing forms and spend 100s of hours trying to get FileMaker to print properly. Every version of FileMaker has printing problem. FM 11 and 12 where especially problematic. Here is where to report bugs http://forums.filemaker.com/hives/1eea103f05/summary . Printing usually does get better with version revs. The problem I'm having with 13 is if I script out multiple pages to print, the script will crash and FileMaker needs to be restarted.
Strange, but I tried that link earlier and couldn't log in. Now I can, after trying alternate credentials... but it tells me my password is wrong, then logs me in and thinks that I'm one of my other clients. Where do a go to report a bug in the bug report? :-D
Anyhow, I've posted this now. Hopefully I'll get a fix before I'm forced to roll back or do an overhaul of the whole thing with a 3rd party product.