Check the VST connections that on the "Studio" tab you have an audio device assigned to the audition bus. Also check in the mixer that the audtition channel fader is not on muted.
I've had this problem as well, ofted I've just had to close Cubase and open it again to get the click going again. Doesn't seem to be a bus routing issue, more like a cubase bug...
definitely a bug...if i fire up cubase with my interface turned on, everything works fine
if i start cubase will the interface is off, then turn on the interface and select it under the device setup, i have to restart cubase to get the click to work. everything else will work fine, but that damn click...
Ditto, I don't have the exact same problem, but generally I've learned that if I open Cubase before turning on my interface, or turn off my interface before closing Cubase, it gets super pissed.
haha i thought my computer was just shit and fucking me about all the time, but yah, i always get this, and its always when i'm in a rush to quickly try something out