I'll be honest I haven't been running the bundles I've been building test packages from SVN which are working fine, however I have noted that over the last 6 months of Ardour3 development that certain plugins present on the system can cause trouble with A3 being able to launch.
Some things to try...
1. You installed the Ardour bundle as Root correct?
2. Remove the 'discodsp-linuxvst-demo' package
3. Update the following plugins packages to these versions:http://bandshed.net/custom/linuxvst-plugin-pack_20120229+a3beta-avlinux-1_i386.debhttp://bandshed.net/custom/linuxdsp-lv2-demos_20120229avlinux-1_i386.debhttp://bandshed.net/custom/linuxdsp-linuxvst-demos_20120229avlinux-1_i386.debhttp://bandshed.net/custom/linuxdsp-jack-demos_20120229avlinux-1_i386.debhttp://bandshed.net/custom/linuxdsp-guitarfx-demos_20120229avlinux-1_i386.deb
Let me know if there is any change...If not I'll install a bundle and have a look when I get time