Max as host: isPlaying() returns false

We are developing a VST plugin in JUCE which needs Host information such as the playing status, timing info etc.
Everything works fine in Ableton or Reaper but we don't get any host information from the native MaxMSP VST~ object (transport on).
It seems that the external doesn't return anything over the isPlaying() method from JUCE. (isPlaying() simply returns false)

Any thoughts?