OSC on windows

So I’ve just been trying to connect Reaktor (standalone in this case, VST works much the same) via OSC to renoise, to make working with my MIDI effect more efficient. So I’m trying to connect and send /renoise/trigger/note_on and _off messages. In some way though, only the first of every 3 million messages seem to go over (just kind of random?), and even when sending test signals from Reaktors OSC config window, the Renoise log window shows nothing. Could it be Windows (7) firewall bugging, or something else one might not think of?