Mac OS error -208 when opening MIDI files in Quicktime Pro

Quicktime no longer plays MIDI files. it used to. now i get the Mac OS error -208 claiming the file is corrupted. but i can play the file on a PC, and other people receiving the files by email can open them (though a few other Mac owners are now also having trouble for the first time).
this problem started about two weeks ago. i did nothing different to my machine (MacBook pro), and wonder if a background system update is to blame.
i uninstalled Quicktime and reinstalled it. no luck. any ideas?

here's some further clarification, provided by John Hetland, who worked out the fix:
1. The MIDI analyzer I used is a cool freeware program midi2txt.exe from
http://www.gnmidi.com/
2. When I ran midi2txt with the -error switch and the name of the MIDI file,
it said something like "Warning: 21 bytes of garbage at end of file." It
turned out that the MIDI file was made in fixed-length records, and there
was space left over in the last record. This situation is simply ignored by
most players, but the current version of QuickTime apparently doesn't know
what to do if the file is not EXACTLY the length needed for the MIDI codes.
3. I can't give instructions for fixing the error because what I fixed was
not any MIDI file; I fixed the program I wrote that generated the flawed
MIDIs. But if someone should encounter this very problem in a MIDI from some
other source, and that someone has expertise in file manipulation, one
should look for hex 'FF2F00' in the last record and delete everything that
follows it.

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