MIDI "text" events crash Linthesia ("Unknown MIDI event type"). For example, MuseScore (musescore.org) uses these events when exporting .mid files of sheet music, to show the song title, subtitle and author.
Try opening this .mid file, for example, in timidity (to see the event) and Linthesia (to see the crash):
I really hope that this project isn't completely discontinued. Synthesia has been improved a lot while Linthesia seems to be a dead project. Please keep on the good work, I love this program! :-)