I'm assuming you have the Nexus S drivers installed on your Mac? Was it working before?
The call issue is common on build 14, so I would let other people test out the next one before flashing it (nandroid FTW)
Does anyone have probles with your captivate seeing your external SD card?
As noted in the CM faq, they changed where it is mounted from a Samsung ROM. Look at /mnt/emmc
Just updated to 32 and oddly enough after I rebooted I lost root status. I find that kind of odd, but would it be safe to say that I could just go ahead and root it again?
I would think so, but the Captivate root method won't work on Gingerbread.
According to one of the devs, you haven't actually lost root, the issues just have to do with some features they're implementing to allow the ROM to be used without root. Have you checked it through terminal?
Personally, I'm just sitting tight until the issues are sorted out. If you have a backup, I would go back to that.