Error loading an XSLT

[memurphyiii]

Hi,

I've run into a problem that I haven't been able to find a whole lot of
information on and I'm hoping someone might recognize it enough to give
me some pointers.

I've got the following code:

XslTransform myTransform = new XslTransform();
myTransform.Load(@"M:\MyData\MyTransform.xsl");

When the call to the Load routine executes, I get a system
ArgumentException with the description "Invalid Site".

Here's the stack trace:
at System.Security.Util.SiteString.CreateSeparatedSit e(String site)
at System.Security.Util.SiteString..ctor(String site)
at System.Security.Policy.Site.ParseSiteFromUrl(Strin g name)
at System.Security.Policy.Site.CreateFromUrl(String url)
at System.Xml.XmlSecureResolver.CreateEvidenceForUrl( String
securityUrl)
at System.Xml.Xsl.XslTransform.Load(String url, XmlResolver resolver)
at System.Xml.Xsl.XslTransform.Load(String url)
...

I haven't been able to find much information on CreateSeparatedSite and
what I've been able to find on ParseSiteFromUrl doesn't really tell me
much. The XSL file is there and teh XSL code is correct (it's been used
in other instances with no problems.) This is the first time this code
has been tested on this particular laptop running Windows 2003 server,
but it's been run on that platform (and other) Windows boxes elsewhere
and not received this error.

Could this be a system setting under security? In order to test this
code, I did have to create a FullTrust Runtime Security policy for the
URL file://M:/* under the .NET configuration for Runtime Security
Policy > Machine > Code Groups > All_Code. Might there be some other
entry I have to make?

Got a headache from banging my head against this one, so any help is
MUCH appreciated.

Regards,
Ed