Sideheads are a document level property for text frames, so once triggered, the effect is everywhere.
Which version of FM were you using? Where you adjusting any other properties before this happened? Did you import any other FM documents (insets)?
I am using FM 11. I do not think that I was adjusting any properties.
No I did not import text insets.
The effect, though, is not everywhere. The new text frames that I create inside anchored frames do not contain side heads.
Are the text frames part of a different flow?
You might wan to try a MIFwash (i.e. save the file as MIF, open the MIF and re-save as binary .fm) to clean out any crud that might have triggered it. See Re: Internal Error: 11024, 21101821, 21093447, 19354980 for details on using the Book MIFwash utility in FM11.
This has happened,
heck still happens to me.
(more than once)
even today, to ONE chapter of a 14+chapter document..
I too did not CHANGE any of my settings, it just decided it wanted my text boxes to have side headers.
(which is why I found your question while trying to find an answer.)
The fastest way I have found SO FAR to fix it, is to
Select each text box,
The Text Frame Properties box shows up, and it has a check box in the Flow -Room for Side Heads pane.
Now, I have no idea why, but my FM11 decided that it wanted 1.5" with .25gap on my text boxes.
I had to un-check, and Apply.
but it was easier than copying the information and putting it in a new text box, (which oddly enough, also works... )