nautilus-clamscan doesn't find viruses after DB update with freshclam

[Pedro Dias]

After an update of the clamav database using freshclam (runs by default every hour) nautilus-clamscan no longer detects any viruses in files previously infected (right after bootup of ubuntu). By executing the command 'nautilus -q', or rebooting, the problem temporarily disappears until the next automatic update.

OS: Ubuntu 10.04.1 LTS

Package versions: linux-generic-pae (2.6.32.25.27), nautilus (1:2.30.1-0ubuntu1.1), nautilus-clamscan (0.2.2-2ubuntu1), clamav (0.96.3+dfsg-2ubuntu1.0.10.04.1)

[Pedro Dias (pedro-dias-77)]

Invoking the same function that nautilus-clamscan uses to scan the files from within python causes an error:

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyclamav
>>> ret=pyclamav.scanfile("/tmp/xpto.pdf")
LibClamAV Error: cl_load: engine == NULL
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
pyclamav.error: Null argument passed to function
>>>