Yup that did the trick. Indeed I did have the buntu package installed, and it was still giving me the error. Compiling & installing fixed that.<br /><br />Couldn&#39;t run the plugin, zynjacku & lv2host both gave a traceback, see here if intrested in details: http://fpaste.org/IXH9/<br />Ardour2 crashed too, as did my own project.<br /><br />What version of zynjacku / lv2host can you confirm it works in? I can grab that revision and test if needed.<br /><br />Cheers, -Harry