Hi,
try this:
- Open Nuendo 6.0.3 and create a new project (I tested 48KHz, 32 bit)
- Drag & drop .wav files from Finder (MAC OSX 10.8.3)
- When “one track or different tracks” import option prompt appears, do “different tracks”
- Now any mouse click is unresponsive (mute, solo, select…) both arrange and mix console
- If you save and reopen the song everything works fine
THX