OK I'm not sure which update broke my root, but I am on IMM67I
I noticed too that in the superuser app there were no requests, and when going into a terminal and typing su I get 'permission denied'.
First port of call was superboot v4.. that hung at the google screen. Then I temp booted CWM and flashed su_ICS_GN.zip...
Once booted still no access in terminal (permission denied), so I deleted su and superuser.apk (how? Surely I need su to delete these?), then flashed again.. exactly the same.
Downloaded the linked file above and got:
Error in Superuser-3.0.7-efghi-signed.zip
Incidentally, this is the same version of su that is in su_ICS_GN.zip
When going into superuser and trying to update the binary, it says 'cant get root'..
Downloaded just the binary only and get exactly the same as above (installation aborted). Looked at the update_script and cannot see anything wrong....
I've just tried to boot an unsecure image so I can push the new su binary.... stuck at the Google screen...
---------- Post added at 10:59 AM ---------- Previous post was at 10:45 AM ----------
OK I used the 'Galaxy Nexus Toolkit' which must have an updated insecure image I guess to push the right su binary..
I had to manually get it into bootloader mode as it didnt reboot (even though it detected the phone at adb).... and then the script continued OK..