I found that Phidgets was not marked as "identified developer" on my Macbook. By accident, when installing another app, I found those check-boxes in "Security & privacy" preferences. Since I checked the check-box for Phidgets, it is working!
...and the objects are no longer working. this is now happening under high sierra and el capitain both with phidgets 21 & 22 installed. i tried deleting and replacing the interfacekit objects but no luck. any suggestions?