Looks like maybe you broke CPhidget_openRemote() for the wild card serial number (-1). This worked in the 12/22 release, but not in the 3/1 (or the 3/10.)
The effects are obvious if you double-click on a remote phidget in the "Bonjour" window under System Preferences--it launches a phidget-specific app that doesn't actually find the module. This doesn't seem to be module-specific; the same effect is seen for both LED controllers and the 8/8/8 part of SBCs.
I verified this behavior with my own app--an openRemote on -1 never gets an attach callback...