A family of Microsoft word processing software products for creating web, email, and print documents.
I tried as well. Same result. I then saved the document in legacy format (.doc) and the macrobutton works.
It Word 2010 (docx) format all that happens is the picture is selected and you get picture editing tools. Bottom line: To have the macrobutton work with a graphic, you must be in .doc (.dot) format.
Sort of like legacy WordArt, I guess. Except with WordArt if I create WordArt using the legacy gallery in a .doc formatted document and then convert that document to Word 2010, my Word Art stays. With the macrobutton, it reverts to not working.
Additional note:
I made my macrobutton prompt as follows:
prompt [graphic] prompt
That is the word prompt surrounded the inline graphic. In the .doc format, you could see the word "prompt" on each side of the graphic. In the .docx format, the first word "prompt" is occulted by the graphic which is followed by an equivalent amount of space before the second word "prompt" appears.