The software works perfectly under MacOS 10.8 Mountain Lion with the patch. Thanks for the update.
Regarding the problem with my Wiimote that couldn’t connect, it seems that this is due to the new identification of the latest version of Nintendo Wiimote. These new wiimotes identify as RVL-CNT-01-TR (you can see that in the log window), which seems to confuse Wiimote Whiteboard and prevents it from connecting. Swapping my new Wiimote with an older one solved the connection problem, as the older ones identify as RVL-CNT-01 (with -TR at the end).
Therefore, BEWARE WHEN BUYING THE LATEST VERSION OF THE NINTENDO WIIMOTE, as these newer model won’t work with the current version of Wiimote Whiteboard!
This problem also seemed to confuse SmoothBoard, but the latest version of SmoothBoard fixes this issue, as seen here: http://www.smoothboard.net/wiiremoteplus/
Thibaut