How are you viewing the PDF?
I open it with Acrobat pro.
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Are there other interactive elements close to this button? And if so, could the other elements interfere with this button? Keep in mind, the hot spot of an interactive element is the rectangular shape that reaches to all sides. A circular button has a square hotspot. These areas can overlap each other. A hovering mouse could trigger a rollover on or off without being over the actual button.
No, there are no other elements.
I have made a try, I opened the file with an other computer and so acrobat 9.5.5. It worked!
But it still does not on my computer (acrobat 10.1.1).
Did you test with some Adobe Reader versions?
Versions 9, X, XI and DC ?
On what devices should the PDF be viewable?
Desktop machines only with Adobe Reader as viewing software?
Then go ahead testing.
Web browsers with the browser's PDF viewing capabilities?
Then, I fear, it is no solution to export to PDF.
EPUB Fixed Layout or Publish Online (HTML with fixed layout) would be possible.