This method call is missing from leobridge.py when initializing after starting up:
g.app.loadManager.createAllImporterData()
I had to add it in leointeg's server in order to import files successfully. It should be done in leobridge.py automatically if I'm not mistaken :)
(Let me know if/when it's moved to the devel branch of Leo, and I'll remove it from leointeg's server)
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Félix