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NavDialogRun hangs

Hi,

I'm having a weird situation where on roughly one out of fifty Tiger systems, our application hangs in NavDialogRun() and never returns. The Navigation dialog shows only the window, but no content. The window can be moved, but other than that, there's no response and just the spinning beachball. The application is a CFM app build with CodeWarrior 8 (before you say it, yes, we are already taking it to Xcode, but this problem can't wait that long).

The code I'm running is the following:

NavDialogRef navDialog;
NavDialogCreationOptions navOptions;
NavGetDefaultDialogCreationOptions(&navOptions);
OSErr dlgErr = NavCreateAskSaveChangesDialog (&navOptions, NULL, NULL, NULL, &navDialog);
if (dlgErr == noErr) {
NavDialogRun(navDialog);
switch (NavDialogGetUserAction(navDialog)) {
case kNavUserActionCancel:
response = answerCANCEL;
break;
case kNavUserActionSaveChanges:
response = answerYES;
break;
case kNavUserActionDontSaveChanges:
response = answerNO;
break;
default:
response = answerYES;
}
NavDialogDispose(navDialog);
}

As said before, this happens on maybe one out of 50 systems and does not seem to be related to hardware configuration whatsoever - the only thing these systems have in common is 10.4.x.

Stefan
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