GridServer 6.3.1 Hotfix1 has been released. Here are the release notes:

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Affected Components for 6.3.1_hotfix01

The following components are updated by this hotfix:

Admin Interface
Database
Engine Daemon
Java Specific
Manager
Scheduler
Security
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Closed Issues in 6.3.1_hotfix01 (This Release)


Admin Interface
GS-14813
Support for 32-bit Solaris Operating System has been deprecated, therefore
references to "solaris" or "Solaris" in the Manager Admin Interface always refer
to 64-bit Solaris Operating Systems only.  

GS-15495
Resolved an issue where Grid Search could result in a NullPointerException.


Database
GS-15628
Support has been added for PostgreSQL as a platform for the Reporting Database.


Engine
GS-15666
Fixed an issue that resulted in a StringIndexOutOfBoundsException with long HTTP
messages.


Engine Daemon
GS-15485
Fixed an issue that was causing a large number of NumberFormatException messages
in the Engine and Director logs.

GS-15598
Fixed an issue where Core Relative Engine Instance setting under Engine
Configuration was not working for Unix Engine.


Java Specific
GS-15779
Engine JRE version is now updated to version 1.8.0_221.


Manager
GS-15657
On importing configurations, a restart will now only be required when the
changes made have been successfully imported for the Director and Broker
Properties.

GS-15677
Fixed a performance issue where User Admin page loads slowly when LDAPS
authentication is enabled.

GS-15732
Added support for custom log date formats.  All Java Simple Date format styles
are supported with the exception of time zone related (z or Z).

GS-15857
Engine notifications will be now performed in multi-threaded manner.  

GS-15859
Changed the Driver and Engine keep-alive to default to false.

GS-15924
HTTP connections were being kept open due to default keepalive settings in the
HTTP client code. Reverted the setting to previous default (false).


Scheduler
GS-15638
On the initial engine install, some time, some the engine instances start to
take the tasks when the engine instance 0 still sync the grid-libraries.  We fix
this by asking all engine instance to wait until all dependent Grid Libraries
are loaded before running tasks.


Security
GS-15945
Fixed issues where case-sensitive usernames and passwords were handled
incorrectly. After applying this hotfix, any users with a case-sensitive
username who changed their password while running the previous hotfix will have
to set a new password. Also, creating a new user with a mixed-case username
won't automatically change a previously-created all-lowercase username.
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To download this hotfix, login to the Support Portal and navigate to Downloads > Hotfixes > AvailableDownloads > DataSynapse > GridServer > 6.3.1.