Solution from anders_gud on the bug page. The pyano / pydrum packages are installing under the /scratchbox directory, which causes the tablet-browser-daemon to ignore one of it's variables. Solution: remove pyano / pydrum, reboot - problem solved. If you still want pyano / pydrum to work we'll need to move it's binaries, or ask Aisu to repackage so we don't have to move it ourselves.