Referencer reports <class 'xml.parsers.expat.ExpatError'> when quering ISI

Hi everyone

I got kind of a large overall problem. Perhaps it is a bug, yet I don't know. Here is what I did:

I installed referencer from the ubuntu software-center (Natty, Unity). Then I linked PDF's to referencer to administrate my library and have an easy and quick access to my literature. A feature I like (according to promised program features) is the automatic retrieval of literature info (journal, pages etc.) - but that does not happen...

When I link the pdf - the only data that are taken out of the pdf is the doi and places the pdf-name as title (as it seems). When I try to retrieve information (even with correct paper title) nothing happens - the information in the referencer remains the same. Even if I give more info like (the correct) year and author, the information are not retrieved from the net. What is the problem here? (I use VPN-connection to my university. Access to ISI is possible when I manually access documents.)

I already tried to purge and reinstall referencer --> no change whatsoever in behaviour.

After that I tried to retreive metadate explicitly from ISI by clicking the respective button in icon bar. The answer was (translated from german):
____________________________
Exception: <class 'xml.parsers.expat.ExpatError'>

Module: isi-plugin
Explanation: no element found: line 1, column 0
_____________________________

The terminal output is:
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bool Transfer::waitForFlag(volatile bool&):
 Waiting...
void Transfer::openCB(const Gnome::Vfs::Async::Handle&, Gnome::Vfs::Result):
 result not OK

(referencer:5003): libgnomevfsmm-WARNING **: gnome-vfsmm Async::Handle::cancel(): This method currently leaks memory.
bool Transfer::waitForFlag(volatile bool&):
 waitForFlag completed due to transferfail
PyObject* referencer_download(PyObject*, PyObject*):
 got 0 characters

virtual bool PythonPlugin::doAction(Glib::ustring, std::vector<Document*>):
 PythonPlugin::doAction: NULL return value
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The for curiousity I clicked on the Lyx button. Answer there (translated from german):
__________________________________________
Exception: <type 'exceptions.TypeError'>

Module: lyx
Explanation: exceptions must be old-style classes or derived from BaseException, not str
__________________________________________

Terminal output was:
__________________________________________
virtual bool PythonPlugin::doAction(Glib::ustring, std::vector<Document*>):
 PythonPlugin::doAction: NULL return value
__________________________________________

Oh, and btw I have this bug https://bugs.launchpad.net/referencer/+bug/494684 too. Yet, I don't know how to install the code provided as a patch in that post. I'm just an ordinary user --> I would need some explanation on how to install such a patch.

Thanks in advance for your efforts.
Stefan