Known Problems - 5.0.3
Error validating dmlserver.xml after 5.0.3 upgrade
The upgrade to 5.0.3 replaces dmlserver.dtd making a 5.0.2-valid dmlserver.xml file no longer valid. To make your dmlserver.xml, delete the Logging tags and its contents from both <LibraryName>_CATALOGING and <LibraryName>_PRODUCTION.
FreeDB fails to find matches in Import Tracks Window