I don't know what could be causing the issue, but since you're running the first and most buggy leak, perhaps you can start by flashing another rom based on the most current leak (UCLE2)?
Here's the link to the link:
[ODIN] SGH-I727 Build UCLE2 - Android 4.0.4 - xda-developers
If you're feeling more adventurous, custom roms based on this leak are available in the same section (Android Development).