Problems with Windows 2003 Service Pack 1 and IsolatedStorage

[Simon Chester]

Hello! Can anyone help me with this problem?...

I have developed an ASP.NET (version 1.1) application which I have deployed
to a number of webservers.

The web application works fine on Windows 2000 Server computers. It also
works OK on Windows 2003 Server UNTIL Windows 2003 Service Pack 1 is
installed!

The error and stack trace I am given is:

[DirectoryNotFoundException: Could not find a part of the path "*".]
System.IO.__Error.WinIOError(Int32 errorCode, String str) +287

System.IO.IsolatedStorage.IsolatedStorageFile.GetF ileDirectoryNames(String
path, String msg, Boolean file) +373
System.IO.IsolatedStorage.IsolatedStorageFile.GetR andomDirectory(String
rootDir, Boolean& bMigrateNeeded, String& sOldStoreLocation) +55

System.IO.IsolatedStorage.IsolatedStorageFile.Init GlobalsNonRoaming(IsolatedStorageScope scope) +112

System.IO.IsolatedStorage.IsolatedStorageFile.GetR ootDir(IsolatedStorageScope
scope) +98

System.IO.IsolatedStorage.IsolatedStorageFile.GetG lobalFileIOPerm(IsolatedStorageScope scope) +208
System.IO.IsolatedStorage.IsolatedStorageFile.Init (IsolatedStorageScope
scope) +37

System.IO.IsolatedStorage.IsolatedStorageFile.GetS tore(IsolatedStorageScope
scope, Type domainEvidenceType, Type assemblyEvidenceType) +66
System.IO.IsolatedStorage.IsolatedStorageFile.GetU serStoreForDomain() +12

CMTC.Web.Configuration.WebAppConfigurator.WebAppCo nfigurator.LoadAppSettings()

CMTC.Web.Configuration.WebAppConfigurator.WebAppCo nfigurator.GetValue(String
key)
CMTC.Kumquat.KumquatConfigurator.get_IsDataSourceF ullyConfigured() +41
CMTC.Kumquat.KumquatConfigurator.get_IsFullyConfig ured() +12
CMTC.Kumquat.Global.Application_BeginRequest(Objec t sender, EventArgs e)
+562

System.Web.SyncEventExecutionStep.System.Web.HttpA pplication+IExecutionStep.Execute() +60
System.Web.HttpApplication.ExecuteStep(IExecutionS tep step, Boolean&
completedSynchronously) +87

As you can see, this problem is been caused by an Isolated Storage function.
I am confident that my code is correct (because it works fine on Windows 2000
and before Windows 2003 SP1 is applied). Therefore, I suspect that the
service pack changes some permissions on the computer that causes this
problem. However, I have been unable to determine exactly what permissions it
changes (machine.config and File System permissions for the Network Service
user look OK).

Has anyone else experienced anything similiar? What is it that Windows 2003
Service Pack 1 changes that interrupts the way my app uses Isolated Storage?

Any suggestions gratefully received!