mojoPortal Version:   2.3.6.5 MSSQL
Operating System: Microsoft Windows NT 5.2.3790 Service Pack 2
ASP.NET Info: Running in Partial Trust

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I am receiving the following error when going to MemberList.aspx from the Admin. This is a standard installation. I'm not sure how to reproduce the error. I just noticed it today when going to assign permissions for a user.  

Any help is greatly appreciated.

The error in system log is:

2011-05-14 17:13:47,989 ERROR mojoPortal.Web.mojoBasePage - xx.xx.xx.xxx-en-US - /MemberList.aspx
System.NullReferenceException: Object reference not set to an instance of an object.
   at mojoPortal.Web.UI.Pages.MemberList.OnInit(EventArgs e)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
2011-05-14 17:13:48,052 ERROR mojoPortal.Web.Global - xx.xx.xx.xxx-en-US - /MemberList.aspx
System.NullReferenceException: Object reference not set to an instance of an object.
   at mojoPortal.Web.UI.Pages.MemberList.OnInit(EventArgs e)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Yes, this is a pre-compiled release installation.
Yes, it is a custom skin.
No, the error does not go away with a mojoportal skin.

The site is running in partial trust. Could it be a permissions issue?

I re-installed the bin folder, but no change. I can try re-installing the whole site.
Any other suggestions for troubleshooting?

I received this error after re-installing the bin folder and running /Setup/Default.aspx. But it doesn't appear again after I cleared the System Log. Not sure if helpful.

2011-05-17 11:05:13,216 INFO mojoPortal.Web.Global - Global.asax.cs Application_End
2011-05-17 11:20:53,278 INFO mojoPortal.Web.Global - Application Started.
2011-05-17 11:20:53,310 ERROR mojoPortal.Web.Global - Application_Start Could not register VirtualPathProvider, this error is expected when running in Medium trust or lower
System.Security.SecurityException: Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
   at mojoPortal.Web.Global.RegisterVirtualPathProvider()
   at mojoPortal.Web.Global.Application_Start(Object sender, EventArgs e)
The action that failed was:
InheritanceDemand
The type of the first permission that failed was:
System.Web.AspNetHostingPermission
The Zone of the assembly that failed was:
MyComputer