After searching around a bit more, I discovered that the issue is with running wine on 64 bit. The jack lib it uses is part of the emul-linux-x86-soundlibs package. I tried unmasking the emul-linux-x86-* packages to upgrade them to the current version. After I did this and ran jackd in debug mode and ran winecfg, when I hit test jackd showed a client connecting. However wine immediately crashed. So it looks like jack with wine on 64bit is a no go at the moment.
