It's great that your problem has been fixed with restart.
As you are running with very old version and new version 12.1 ru5 is release in English Language and avaialble in file connect which fixed the defintion issue. In this version all content converts from full definitions to delta definitions.
English versions of Symantec Endpoint Protection 12.1.5337.5000 (RU5) is now available
https://www-secure.symantec.com/connect/blogs/symantec-has-released-new-version-symantec-endpoint-protection
Upgrading or migrating to Symantec Endpoint Protection 12.1.5
Article:TECH224034 |
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Created: 2014-08-22 |
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Updated: 2014-09-19 |
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Article URL http://www.symantec.com/docs/TECH224034
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Symantec™ Endpoint Protection 12.1.5 Installation and Administration Guide
Article:DOC7698 |
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Created: 2014-09-16 |
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Updated: 2014-09-19 |
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Article URL http://www.symantec.com/docs/DOC7698 |
New fixes and features in Symantec Endpoint Protection and Network Access Control 12.1.5
Article:TECH224706 |
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Created: 2014-09-17 |
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Updated: 2014-09-19 |
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Article URL http://www.symantec.com/docs/TECH224706 |
Symantec™ Endpoint Protection, Symantec Endpoint Protection Small Business Edition, and Symantec Network Access Control 12.1.5 Release Notes
Article:DOC7696 |
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Created: 2014-09-16 |
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Updated: 2014-09-19 |
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Article URL http://www.symantec.com/docs/DOC7696 |
New Platforms: Windows 8.1.x, Windows Server 2012 R2.x and Mac OS X 10.10
What’s New
As part of the upgrade to Symantec Endpoint Protection Manager (SEPM) 12.1 RU5, all content converts from full definitions to delta definitions.
This process is resource intensive and upgrades may take longer than expected. After this process is completed, the SEPM will use significantly less disk space
For more details check article
The LiveUpdate content optimization and content storage space optimization steps take a long time to complete when upgrading to Symantec Endpoint Protection Manager 12.1 RU5
Instructions for Installing SEP 12.1 RU5 Files
The primary download is distributed into two installation files: Part1_Installation and Part 2_Tools.
Please download and extract both files before continuing with the software setup.