Sounds like you have character styles in your captions. I don't know why Ctrl-Space and Ctrl-Q didn't work. Normally that would remove all local formatting AND character styles from the selection. If it didn't then perhaps your field or text is protected.

There is a command to remove all local font formatting (local and character style)
Selection.Font.Reset

And a different command to remove local but retain character styles
Selection.ClearCharacterDirectFormatting 'Retain character styles

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Andrew Lockton
Chrysalis Design, Melbourne Australia