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i see you're using more than one instance of fluidsynth-dssi.

as a matter of fact the current latest released version (v1.0.0, since 2009) of the fluidsynth-dssi plugin has a crash bug that serious manifests when you instantiate more than one instance of it; this bug has been corrected upstream and should be silent now on git head (ca. 2012); unfortunately most if not all distros, including opensuse, still deliver the old bugged version.

i believe this is the root of your troubles with fluidsynth-dssi, there might be others but this is one i know for sure. and this might relate to both of your questions above.

you have some couple of options here then:

1. avoid having more than one instance of fluidsynth-dssi plugin in any one time; if you're loading the same sf2 file on each MIDI track for instance, consider to make it a single instance inserted on an output MIDI bus instead;
2. un-install current package, clone and build and install from upstream git repo and try and test whether the same troubles still prevail every so often.

take both and all will be even finer, i hope ;)

hth.
cheers