I've tested some things on Win7 and happen to have an Emacs24 installed there, so I compiled the latest org-mode. I got quite a few warnings that I've never seen before with Emacs23, so I assume this is Emacs24 tightening the screws on some loseness. I don't remember the exact warning text, but it was something about top-level forms and global variables not having a prefix (presumably to keep them in their own namespace and not step on the toes of other packages).
Regards, Achim. -- +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+ Wavetables for the Terratec KOMPLEXER: http://Synth.Stromeko.net/Downloads.html#KomplexerWaves