I did some investigation and found the problem, XPStar.dll contains a bug.
File Version 2014.120.2000.8
Product Version 12.0.2000.8
Size 409 KB
As a workaround, and the method I used to prove my findings, was to copy XPStar.dll from my 2012 instance and replace the file on my 2014 instance (after backing up of course). After restarting SQL Server the issue was solved.
By default the 2012 location is:
C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\Binn
and the 2014 location is:
C:\Program Files\Microsoft SQL Server\MSSQL12.SQL2014\MSSQL\Binn
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