It's very strange, but when I turn on any MIDI, my browser, calculator, and other things start opening. I went to a keyboard test site to see where this script is pressing, and for some reason it's touching the fn+... combination, pressing the volume up, mute, and other keys. I did everything according to the instructions, and this happens with all MIDI, just different combinations
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That IS very strange; my script doesn't touch anything besides the notes keys (qwertyu, asdfghj, zxcvbnm) plus shift and ctrl for sharps and flats. See my source code on GitHub.
I've looked into this a bit more. The only function key I'm touching is F11 for the global stop. I'm guessing that your keyboard/driver, or maybe your OS, uses some of these [ctrl + letter] combinations as shortcuts for volume/play functions. If you want to test this theory, on your desktop with everything minimized, hold down ctrl and then all those letter keys in sequence and see if they do anything?