GridServer 5.2.1 Hotfix2 has been released. Here are the release notes:

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Affected Components for 5.2.1_hotfix02

Engine
Java Specific
Services
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Closed Issues in 5.2.1_hotfix02 (This Release)


Engine
GS-15995
The Engine will now search correct directory paths when a shared service session
has a Grid Library dependency in a different directory path than was previously
expected.  


Java Specific
GS-15777
Engine JRE version is now updated to latest version - 1.8.0_221.


Services
GS-15996
When creating services using encryption on the Driver, DH key verification will
first be performed on the Manager.  A new Driver Property DSVerifyEncryptionKey
can be set to an integer value representing the number of times to retry
generating new keys before failing.
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To download this hotfix, login to the Support Portal and navigate to Downloads > Hotfixes > AvailableDownloads > DataSynapse > GridServer > 5.2.1.