Having the same problem with my Galaxy S2 (SGH-I727R).
The latest Kies for Mac (184.108.40.20652_14) is definitely pretty broken. After installing, it did not detect the phone at all, with errors like:
5/21/12 10:54:07.000 AM kernel: 0 1 AppleUSBCDCACMControl: start - Failed to find the CDC driver
5/21/12 10:54:08.000 AM kernel: 0 2 AppleUSBCDCACMData: start - Find CDC driver for ACM data interface failed
Initially I had two of the kexts running in the kernel (SamsungComposite, SamsungACMControl), after running the above kextload commands, I had four (first two plus SamsungMTP,SamsungACMData), but at some point SamsungMTP got kicked out of the kernel it seems, so now I'm back to three.
The good news is Kies is now at least detecting the phone, but it spins endlessly trying to connect.
When I connect the phone USB, in the console I see a lot of lines of:
5/21/12 12:05:01.198 PM Kies: writestring ====>>> AT+PROF=CONTINUE, timeout = 15.000000
With the occasional line like:
5/21/12 12:04:58.233 PM Kies: writestring ====>>> AT+PROF="Phonebook_com.google", timeout = 15.000000
Then these two final lines:
5/21/12 12:05:01.264 PM Kies: writestring ====>>> AT+PROF=END, timeout = 15.000000
5/21/12 12:05:01.328 PM Kies: -[BTUIDeviceManager onReceiveDeviceNotification:] ENTER
But Kies never connects. Tried rebooting computer and phone, factory reset, etc. Seems like a pretty common problem given all the forum activity, blog posts etc. Wonder if I'd have more luck on a PC?
Is Kies required for OS updates, or does Samsung do OTA as well?
Update: here are my specs:
* Android 2.3.5
* Baseband I727RUXKJ7
* OSX 10.7.4
* Kies 220.127.116.1152_14