I have also been having some problems with the functionality of the controller and I really hope that Arturia will provide an update soon for it.
Regarding the browsing issue- what worked for me was switching from sound to scene mode from the keyboard buttons and back again. Only then do the category and preset knobs work to browse. This is consistent, every time I open the software up.
Tonight's problem was a new one. With the knobs transmitting absolute mode values, the browsing would only descend and not ascend. Pretty weird. Lots of little problems with this controller that I'll get around to listing some time.