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paramErr from LaunchApplication?

OK, I am *totally* baffled on this one!

Platform: Mac OS X 10.2.6, 768MB RAM

Wrinkle: Launching applications from different disk images.

Code:

if (isMacApplication(&theAppFSSpec))
{
LaunchParamBlockRec pb;

pb.launchAppSpec = &theAppFSSpec;
pb.launchAppParameters = NULL;
pb.launchBlockID = extendedBlock;
pb.launchEPBLength = extendedBlockLen;
pb.launchFileFlags = 0;
pb.launchControlFlags = launchContinue | launchNoFileFlags |
launchUseMinimum;

err = LaunchApplication(&pb);

if (err == noErr)
{
// Do stuff while running
}
}

For some reason, the first LaunchApplication succeeds, but the *second*
LaunchApplication call returns paramErr.

What am I missing here?

--
Glenn L. Austin <><
Computer Wizard and Race Car Driver
<email@hidden>
<http://www.austin-home.com/glenn/>
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