DD-Boost library load failed. Please check vendor's platform requirements (4033011)

After successfully adding a DataDomain DD-Boost device to NetVault and backing up several clients to it,
jobs from a particular client targeting the same DD-Boost device always fail with:

"DD-Boost library load failed. Please check vendor's platform requirements"

Trace from this client, show that while starting any backups (SQL Server or File System), the plugin used will crash after failing to load the dd-boost dlls.

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Error loading dynamic library: This application has failed to start because the application configuration is incorrect. Reinstalling the application may fix this problem.
ForeignRASConnectToDevice() for foreign RAS device failed
C:\BUILD\Windows\LEON_2013JAN17_900102\source\base\library\plugin\plgbackupstreamras.c:3017: assert(NULL != oRASContext->oTransferTypeContext)
Crash program
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On the client the 64-bit dlls are indee present in:
C:\Program Files (x86)\Quest Software\NetVault Backup\dynlib\bit64\
    libDataDomainoncrpc.dll
    libDataDomainpthread.dll
    libDDBoost.dll