I wrote a patch on OSX then sent it to friends to check it out on windows.
One told me that the midiout didn't work properly.
Apparently, if he changes by hand (double click) the port it works, if if sends message with port's letter from Max pref, it works.
But if he use the message from a unmenu, filled with a midiinfo, it never work.
He tried on window XP and it worked.
can anyone confirm this to know if it is a real bug or just an issue with my friend's setup ?