There are tremendous difference between EPUB readers in how EPUB code is interpreted.
What EPUB reader are you using? Have you looked at any others?
EPUB reader being used is an iPad through iBooks.
Have not looked at any other readers except Adobe Digital editions 2.0 (where I typically preview)
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Is it only happening with the Excel formulas or with other words?
It could be a limitation of the iBooks reader in handling text where it find no place to break the line.
You may need to place the formulas as an image instead of text (use the Object > Object Export Options and do a custom rasterization at high resolution).
It is only happening with the formula.
Someone suggested that I try to add a single space between the commas.
If that does not work, I will place the formulas as an image.
The strangest thing is this... nearly every book I do layout for is a book that includes a lot of long Excel Formulas. I have never run into this problem in the past. InDesign is funky that way sometimes.
I will try both adding a space after the comma in the formula and placing an image instead of text. I will let you know which of these solutions works.
Thank you for your time