PROBLEM:
After having upgraded to Libra Esva version 2.5.0.3, it is impossible to save any modifications from menù System->Spam Settings as the page always reports “Invalid Format” for the Spam Score.
SOLUTION:
This is a bug introduced with our latest upgrade applied before Nov 12, 2011. To resolve download and apply as a normal update the patch published under section Download->Libra Esva Antispam->Patches and Fixes, or upgrade to a newer release.