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The standard openSUSE/Packman versions of liblo and liblo-devel (0.25-22.1.2) were actually among the ones I tried yesterday. Just in case, I tried again today, but no luck.

However, I looked deeper into the /etc/hosts issue and managed to solve the problem by adding my actual hostname (not "localhost") to /etc/hosts. Not sure if that's the "correct" way to fix this, but I have working GUIs now so it's fine with me :-) I've never needed to do this before, though.

Unfortunately, though, I've just discovered something strange, which may be related to this, or may be a quirk of the new install (something goes wrong in my audio set-up on every new install, without fail :-)). I have a default template loaded and, though the DSSI GUI now works, sending a test note via "Send test note" for any of the plug-ins I've tried (xsynth, whysynth, fluidsynth) produces no response - no sound and no reaction from the mixer meters. In the following cases, however, sending a test note works fine:

- adding a new track to the template (test note works in this new track only; not in the others)
- re-loading a previous project
- adding a track in a new session with no template

If you have any ideas what may be causing this, I'd be interested to know. I've tried two templates, both of which were working in my previous openSUSE/Qtractor install, but neither of which works now. I've also tried creating a new template in this version of Qtractor and the same problem occurs upon loading it.