For what its worth, I built my own version libqca2-plugin-gnupg_2.0.0~beta3 package. That solved pretty much all gnupg related Psi problems I have had in Ubuntu 9.04. While I haven't done any testing against Debian systems, I figured I'd still mention it, since the problems seems related.
See https://bugs.launchpad.net/bugs/367317 for more information. // Andreas
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