Which version of FM is being used? There have been other reports on the Forum of this happening.
Does this happen spontaneously while the file is being worked on or after it's been saved and re-opened in another session?
Is this for the main flow text frames or for caption/call out text frames within anchored frames (or both)?
Have any formats or MIF files been imported?
Here's what I heard back.
I believe it’s for everything except main text flow, including headers&footers on master pages, and special elements on unused master pages.
It appears to be spontaneous, but I can’t guarantee that.
I don’t use MIFs, and I’m pretty sure no one else does.
Yes to formatting imports , because we frequently change variables in one chapter and copy them back to the rest (esp date doc was last edited – not same as print date per our regulatory agency.) Likewise conditional text. We know not to copy from a file into itself in a book, although it has happened and we do exchange manuals between revisions at times.