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well, i've just built linuxsampler from svn trunk rev.2322 today and it breaks on me too.

it all seems related to the lv2/lilv state api feature recently introduced in the linuxsampler-lv2 plugin implementation.

if you build qtractor with ./configure --enable-debug you'll get a better stacktrace which always points you to linuxsampler's PluginLv2::Restore at the segfault crash spot.

previously, the lv2 state feature extension (when is was independent from a lilv api) it was working great--blame this to the all-mighty-l33t aka. drobilla xD

i'll have to investigate this too, probably i'll have to take measures on this kind of hidenbugs o.O

[UPDATE:] fixed on svn trunk rev.2743+ (aka. qtractor 0.5.3.38+) -- in fact it is a bug in linuxsampler lv2 state interface, due to lack of validation for some null input parameter.

cheers