1) 8.1.3-0medibuntu0.8.10.2 from medibuntu - with mozilla-acroread
2) acroread 9.1.0 from adobe's website, registering the plugin by hand with nspluginwrapper -i /opt/Adobe/Reader9/Browser/intellinux/nppdf.so; the trace was from the 9.1.0 version (never tried to trace the 8.10.2 version because the first obvious idea was to upgrade, but the behavior was the same).
I have tried with two different versions/sources:
1) 8.1.3-0medibunt u0.8.10. 2 from medibuntu - with mozilla-acroread Reader9/ Browser/ intellinux/ nppdf.so; the trace was from the 9.1.0 version (never tried to trace the 8.10.2 version because the first obvious idea was to upgrade, but the behavior was the same).
2) acroread 9.1.0 from adobe's website, registering the plugin by hand with nspluginwrapper -i /opt/Adobe/