Mmm... you know how they said in that blog post "InfoPath 2003 forms should work. Period"? Well, you can try posting a comment there...
Or you can try to clear your InfoPath cache (for example, from the Run command):
infopath /cache clearall
This will blow away your cache and might fix the problem. Use at your own risk :)
David Airapetyan / Software Services ArchitectQdabra® Software / Streamline data gathering to turn process into knowledge