For objects with 'behind text' wrapping, a permanent solution is to add the 'Select Drawing Objects' icon to the Quick Access Toolbar, then click on that. Doing so allows you to select 'behind text' objects.

A workaround is to temporarily insert a bunch of empty paragraph breaks where the object is so there is no text in front of it; it can then be selected.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]