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Here is the release notes for the latest WX7100 Professional GPU Card: AMD Radeon Pro Software for Enterprise 18.Q3 Release Notes | AMD
By any chance is Microsoft Windows® Server 2016 (64-bit version) the same as the OS you are running Windows Server 2016 Data Center 64bit
Because according to the release notes it is compatible with the :
AMD Radeon Pro Software for Enterprise 18.Q3 is designed to support the following Microsoft Windows platforms:
You should mark your last reply as "Correct" since the updated AMD Professional Driver solved your issue and to let other know what fixed your problem.