The file I had used before now has missing text!
Specifically the "fl" in the book each time a word with "fl" appears.
"Flowables" appears as " owables" throughout the whole book with empty space for the "fl". Any word with an "fl" in it.
The file seems to have "Ligatures" checked in the character palette which I don't usually check.
I can manually replace each missing "fl" but it's a long book, one of many books with same problem.
Any suggestion as to how to get my text back?
You did not try but I guess the letters re-appear if you uncheck Ligatures. For a straight-up sans serif such as Helvetica it won't matter much so you could go for this easy option, but it's still worth the time checking some possible causes to this problem.
Most ligature problems appear because you have more than one version of this font active. Find the exact location of this font with Find Font, de-activate it, then load your document again. If InDesign still can find the font, repeat the procedure until it says it can't find any. Then install only your favourite version, and the problem ought to have disappeared.
Thank you so much!
Thank you so much! I clicked on Correct under your answer.
Unchecking ligatures worked for me, too! This disappearing text has never happened to me before, so I was extremely relieved to find this easy solution. Thank you!