I finally solved this. You need to do the following:
Open /etc/udev/rules.d/25-pemicro.rules in an editor. Remove all its contents, and paste the following:
SUBSYSTEM!="usb", ACTION!="add", GOTO="kcontrol_rules_end"
ATTRS{idVendor}=="15a2", ATTRS{idProduct}=="0035", GROUP="plugdev", MODE="0664"
ATTRS{idVendor}=="15a2", ATTRS{idProduct}=="0042", GROUP="plugdev", MODE="0664"
ATTRS{idVendor}=="15a2", ATTRS{idProduct}=="0058", GROUP="plugdev", MODE="0664"
ATTRS{idVendor}=="15a2", ATTRS{idProduct}=="005E", GROUP="plugdev", MODE="0664"
ATTRS{idVendor}=="15a2", ATTRS{idProduct}=="005F", GROUP="plugdev", MODE="0664"
ATTRS{idVendor}=="1357", ATTRS{idProduct}=="0001", GROUP="plugdev", MODE="0664"
ATTRS{idVendor}=="1357", ATTRS{idProduct}=="0503", GROUP="plugdev", MODE="0664"
ATTRS{idVendor}=="1357", ATTRS{idProduct}=="0504", GROUP="plugdev", MODE="0664"
LABEL="kcontrol_rules_end"
In a root terminal:
$ ln -s /usr/lib/i386-linux-gnu/libexpat.so.1.6.0 /usr/lib/i386-linux-gnu/libexpat.so.0