Alert merely beeping, not displaying

FROM : Randall Meadows
DATE : Wed Apr 02 18:38:22 2008

- (BOOL)burnProgressPanel:(DRBurnProgressPanel *)theBurnPanel 
burnDidFinish:(DRBurn *)burn
{
    [theBurnPanel orderOut:self];

    NSAlert *reminder = [NSAlert alertWithMessageText:msg
        defaultButton:@"OK"
        alternateButton:nil
        otherButton:nil
        informativeTextWithFormat:info];

    [reminder beginSheetModalForWindow:myWindow
        modalDelegate:self
         
didEndSelector:@selector(burnReminderDidEnd:returnCode:contextInfo:)
        contextInfo:NULL];

    return YES;
}

All I get out of that beginSheet... method is a beep; the alert does 
not display, I get no messages anywhere (that I can find) that might 
indicate what's wrong.  The orderOut: message to theBurnPanel works, 
so it's not like I'm trying to put one sheet on top of another.

"msg", "info", and "myWindow" all appear to be valid objects.

Any ideas on how to figure out the problem here?


Thanks!
randy