I went throught the process to root and install unlocked bootloader after upgrading from stock hc to stock 14 ics build. Everything seemed to work well untill trying to install CWM.
EVerytime I rebooted to try to get into CWM I got the old recovery. It seems I had to rename install-recovery.sh. However when I tried to rename with term emu apparently the easy root method no longer works and system remained ro. In order to resolve I had to mount -o remount, rw /system/ then rename install-recovery, then re-run the cwm script.
Check out the Eew245's root method. It give you the most control since you do it by hand. If you don't have adb you can use the one supplied in the ZeroNull easy unlock package(careful to not run the scripts at the wrong time and such though). Anyway Im out of time today. It sounds like as others have said you probably just need to
mount -o remount,rw /system
mv /system/etc/install-recovery.sh /system/etc/install-recovery.sh.BAK
Then reflash cwm if you overwrote recovery when you updated.