The second cumulative hotfix following from Enterprise Vault 10.0.3 has been released. More details are available from the following technote:
http://www.symantec.com/docs/TECH205731
The readme file which is linked to the technote shows you the differences between Cumulative Hotfix 1, and Cumulative Hotfix 2 (which is quite nice). So if you're afflicted by any Enterprise Vault 10.0.3 issues, take a look through the release notes and see if there is something which addresses your issue.