Ive had this issue aswell on every samsung (XXKP/LP) based ICS rom and solved it by doing the following:
1. Root Explorer (4shared is your best friend)
1. Using root explorer locate the /efs/imei/ folder. In that folder there should be a file called keystr. In my case the file was missing which is why the home-button, power button and the lock screen was missing and was causing my problems.
2. using root explorer create a new file called keystr
3. also in root explorer open the file keystr in text editor and type ON
6. make sure you save the file.
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