Hi,
The problem coincides with the following:
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With the introduction of .NET 4.6, Microsoft released a number of changes to the garbage collector in an effort to improve performance. The installer for .NET 4.6 makes these changes effective for previous versions of the .NET framework (not just 4.6).
Unfortunately, early release and pre-release versions of .NET 4.6 include a serious performance problem impacting garbage collection in x64 environments. The impact of this problem is very high, with entire processes being completely locked for minutes at a time. The nature of many algorithms used within NCrunch make it highly susceptible to this problem. NCrunch has detected the presence of this problem on this machine.
To resolve this, it is strongly recommended that you upgrade your version of .NET. Microsoft has released a number of hot-fix updates targeting different operating systems. It is likely that the fix will be later included in other Windows updates or roll-up fixes. The following hot-fixes are known to target this issue:
https://support.microsoft.com/en-us/kb/3093266 - Windows 10
https://support.microsoft.com/en-us/kb/3088956 - Windows Server 2012 R2 and Windows 8.1
https://support.microsoft.com/en-us/kb/3088955 - Windows Server 2012 and Windows 8
https://support.microsoft.com/en-us/kb/3088957 - Windows 7 SP1, Windows Server 2008 SP2, Windows Server 2008 R2 SP1, and Windows Vista SP2
Alternatively, changing your 'Engine hosting strategy' NCrunch global configuration setting to 'x86SatelliteProcess' or 'HostInsideIDE' will enable NCrunch to run within an x86 environment, in which the problem does not appear.
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In this organization I cannot run hot-fixes my self, so I will have to wait for a scheduled roll-up.
Changing the Engine Hosting Strategy did not help with the Hard Error.