Sequential circuits samplers

Well I just thought I'd share a disappointing piece of information (to some I'm sure).
I put one of the new OS4 chips into my P2K and to my dismay sound designer can no longer receive my sample dumps.
The only thing I can narrow it down to is in midi channel select there is a + sign there now that isn't there in the OS3 version,and if I execute it to the - sign it still doesn't work.
Lucky I have two prophets but I know for sure now I won't be upgrading the other one.
For those of you that may have tried to use sound designer without any luck maybe this is the problem. 
Anyone else have luck with the OS4 chip?