Hi all (again),<br><br>problem solved. Our Linux guy started and shutdownd Tomcat as root (don't know why he had to do that) and issued the command "chown -R tomcat.tomcat $TOMCAT_HOME/*". It recursively redefines the owner of the files and folders of the Tomcat directory.
<br><br>Conversely, he gave the tomcat user owner permissions (+r+w+x, I think) into the Tomcat directory. Well, after that he started Tomcat again (this time as the tomcat user) and... the problem was gone. He told me that the problem could have been with some hidden file (.something) that the tomcat user had not permission to see or write.