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Nav Services default location problems

Hello again,
So, I'm trying to manually set the default location of my load/save dialogs now. I'm using the method described in Technical Q&A QA1151:

http://developer.apple.com/qa/qa2001/qa1151.html

I am getting a parameter error -50 from the call to NavCustomControl:

switch( callBackSelector )
{
case kNavCBStart:
{
OSStatus theStatus = noErr;
theStatus = NavCustomControl(callBackParms->context,
kNavCtlSetLocation, (void*)&defaultlocation);
if (theStatus != noErr) RedAlertNum("\pproblem with NavCustomControlCall",theStatus);
}
break;

In my app defaultlocation is defined as

AEDesc defaultlocation;

I set the value of this default location when I load a file. I've tried setting it to both a FSSpec and FSRef,
and both types still give me the error.

err = AECreateDesc(typeFSRef, &newFSRef, sizeof(FSRef), &defaultlocation);

The AEDesc seems to me to be valid. What could be causing the error?

Thanks!
Bob
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