Mise a jours OS 1.05?

slow down your sequencer (120 bpm should work fine, but lower to 90 bpm when you get trouble)
* make sure midi clock is not sent
* make sure no other midi events (metronome etc.) are sent at the same time

Then check this:

* make sure you have no MIDI loop. If in doubt unplug the MIDI out from the synth.
* when downloading with Netscape make sure to use the latest version (some older versions mangled the download file)
* when using a Mac make sure to use the latest unzip software because there have been problems with the unzip
* if all does not help try to download the unzipped version at the ftp server.

Additional info:

Some midi hardware causes problems with SysEx. When I recall right it was one piece from Mark Of The Unicorn (MOTU) that caused lots of trouble.