I'm currently on superclean 2.5 but noticed this issue on 2.4 as well.
Baseband version : S:i500.04 V.EB01
Kernel version: 2.6.32.9
Build number: SCH-I500.EB01
To flash a ROM, I hold down the power button and select 'Recovery' from the menu that pops up. Once I'm in CWM, I select 'install zip from sdcard' -> 'choose zip from sdcard' -> navigate to ROM, confirm the installation, and select 'reboot system now.
To flash CWM, I open Odin on my PC, pull the battery, connect via USB and hold volume down to get the download screen. I then select 'PDA', click the 'PDA' button and select the CWM red .tar. After that, I hit 'Start', and Odin confirms the successful flash.