Just assembled a Arduino Pro Mini 5V, with a SparkFun FTDI, and a Wii Motion Plus board.(Genuine Nintendo) Pic is below.
THe sketch downloads, (COnfiged for a quad) I open the configurator and connect to the arduino.
Press start and... nothing...
The FTDI board is blinking showing comms, and the arduino LED flashes when comms are sent.
All the settings in the GUI are zero, I can change the settings, write, but if I start again, the settings aren't sticking...
Solved that one - uncommented the WM+... ;o) Still no data from the sensor though...

OK, got sensor data now, by switching on internal i2c pull-ups. Data flooding in on the graph, only thing left now is the 3D visualisation in the bottom right cornr doesn't move...
Any ideas anyone??
(I've proven the system by running the the same software on a NanoWii, so I know the Mac/USB/GUI setup is working fine.)
Thanks
Nige