If I create a super-simple addin containing only the two functions described in Getting Started plus the _IntelliSense_ worksheet (GitHub won't let me attach the addin to this post I'm afraid ☹️) then I see the following:
With IntelliSense v1.7.0-rc3 installed, if I make the addin open automatically, either by placing it in an "AltStart" folder, or else with File > Options > Addins, then IntelliSense does not work upon launching Excel. Closing and re-opening the addin brings IntelliSense to life however.
IntelliSense 1.4.2 is not "reluctant" in this way. It would be great to have a fix for this in the final version of 1.7 as I was hoping to upgrade to 1.7 to get the fix for #126 , but this issue would be a blocker.