I have got the same problem, after upgrading to 14.0.1 MP1 the SEPM Java console is not opening at all. It is freezing on the logon process for a while. Web access is working fine.
Symantec knows this issue https://support.symantec.com/en_US/article.TECH236391.html, but did not pulished in Release notes.
My SEPM is riunning on WS2006 Standard virtual machines and both located on ESXi host 5.5. SEP db is MS SQL 2008 R2 SP3.
But SEPM application does not have this isue on the second VM. The first VM has the issue.
If I repair SEPM I can enter to Java console at first time, but it is not working after -:)
Symantec cannot explain this behavior and recommends to upgrade ESXi server to 6.0 update 2 or later. https://kb.vmware.com/s/article/2129176
Please note that previous SEPM versions cannot connect to the updated SEP database with patch 14.0.1 MP1 !!! The database schema changes.
I hope this information would be usefull who is planning for the update.