lot of messages on yahoo group about that are from me , i am GreenComet 
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edit :
the problem it is not the sysex message in this post ( program dump request). the problem is when you send the 220 bytes program dump.
i have seen other post about that in gearslut forum ( polyevolver can’t save program in combo mode)
so it is possible than this problem appear with all polyevolver Rack, but it is difficult to be sure without someone which confirm