ardour 3 gui doesn't shows up under 64 bits ...
I've download the latest svn repo of ardour 3.
I compiled it under mandriva 2010.1 64 and 32 bits.
Under 64 bits, ardour 3 gui doesn't shows up (I started jackd using qjackctl).
But under mandriva 2010.1 32 bits, the gui shows up.
I don't know if it is a known bug ...