SharePoint生产服务器中使用Open XML 2.5创建Word文档触发权限异常的问题求助

大家好，我最近碰到一个困扰很久的问题，想请各位前辈帮忙分析下：

我有一个用Visual Basic开发的SharePoint应用，在开发机器上使用Open XML 2.5创建Word文档完全正常。但最近部署到新搭建的生产服务器后，其他功能都没问题，唯独生成Word格式报告的代码失败了，报错卡在这一行：

Dim wpd As WordprocessingDocument = WordprocessingDocument.Create(MemStream, WordprocessingDocumentType.Document, True)

对应的完整函数代码如下：

''' <summary>
''' 
''' </summary>
''' <param name="MemStream"></param>
''' <returns></returns>
Public Function WPDCreateFromStream(MemStream As MemoryStream) As WordprocessingDocument
    Try
        Dim wpd As WordprocessingDocument = WordprocessingDocument.Create(MemStream, WordprocessingDocumentType.Document, True)
        Dim MainPart As MainDocumentPart = wpd.AddMainDocumentPart()
        MainPart.Document = New Document()
        Dim DocBody As New Body()
        Return wpd
    Catch ex As Exception
        WriteErrorToEventLog("OpenXML", "WPDCreateFromStream", "", ex)
        Return Nothing
    End Try
End Function

触发的异常详情如下：

ERROR: Source: OpenXML Routine: WPDCreateFromStream User:
Message: The type initializer for 'MS.Utility.EventTrace' threw an exception.
StackTrace:    at MS.Utility.EventTrace.EasyTraceEvent(Keyword keywords, Event eventID)
at System.IO.Packaging.Package.Open(Stream stream, FileMode packageMode, FileAccess packageAccess, Boolean streaming)
at DocumentFormat.OpenXml.Packaging.OpenXmlPackage.CreateCore(Stream stream)
at DocumentFormat.OpenXml.Packaging.WordprocessingDocument.Create(Stream stream, WordprocessingDocumentType type, Boolean autoSave)
at FIS.SP.PSTARProjectTracker.PSTAR.Core.BusinessLogic.OpenXML.WPDCreateFromStream(MemoryStream MemStream)
Source: WindowsBase
Data: System.Collections.ListDictionaryInternal

InnerException: System.Security.SecurityException: Requested registry access is not allowed.
at System.ThrowHelper.ThrowSecurityException(ExceptionResource resource)
at Microsoft.Win32.RegistryKey.OpenSubKey(String name, Boolean writable)
at Microsoft.Win32.Registry.GetValue(String keyName, String valueName, Object defaultValue)
at MS.Utility.EventTrace.IsClassicETWRegistryEnabled()
at MS.Utility.EventTrace..cctor()

The Zone of the assembly that failed was:
MyComputer

ToString: System.TypeInitializationException: The type initializer for 'MS.Utility.EventTrace' threw an exception. ---> System.Security.SecurityException: Requested registry access is not allowed.
at System.ThrowHelper.ThrowSecurityException(ExceptionResource resource)
at Microsoft.Win32.RegistryKey.OpenSubKey(String name, Boolean writable)
at Microsoft.Win32.Registry.GetValue(String keyName, String valueName, Object defaultValue)
at MS.Utility.EventTrace.IsClassicETWRegistryEnabled()
at MS.Utility.EventTrace..cctor()
--- End of inner exception stack trace ---
at MS.Utility.EventTrace.EasyTraceEvent(Keyword keywords, Event eventID)
at System.IO.Packaging.Package.Open(Stream stream, FileMode packageMode, FileAccess packageAccess, Boolean streaming)
at DocumentFormat.OpenXml.Packaging.OpenXmlPackage.CreateCore(Stream stream)
at DocumentFormat.OpenXml.Packaging.WordprocessingDocument.Create(Stream stream, WordprocessingDocumentType type, Boolean autoSave)
at FIS.SP.PSTARProjectTracker.PSTAR.Core.BusinessLogic.OpenXML.WPDCreateFromStream(MemoryStream MemStream)
TargetSite: Void EasyTraceEvent(Keyword, Event)

我确定代码本身没问题，因为在开发服务器上已经稳定运行了一年多。我猜测是生产服务器的权限问题，或者DocumentFormat.OpenXML.dll的安装/注册有问题，但搜了很久都没找到解决方案。

我已经尝试过这些操作：

• 在生产服务器上安装了Open XML 2.5和生产力工具，工具能正常打开Word文档，但应用还是报同样的错；
• 确认DocumentFormat.OpenXML.dll已经随.wsp包部署到服务器上，也单独安装过Open XML 2.5，但问题依旧；
• 考虑过MemoryStream的传递方式，试过显式用ByVal，但没有变化；
• 代码是创建新文档，所以用的是WordProcessingDocument.Create，这个逻辑在开发环境是对的。

越想越觉得是权限问题，但不知道具体该给哪个账号加什么权限，或者有没有其他组件没配置好？如果各位有遇到过类似问题，还请指点一下，非常感谢！

备注：内容来源于stack exchange，提问作者Kevin