Yup, you want to backup the fs-base and fs-base-ui-pages folders BEFORE you opt in to SU11. If you revert back to SU10, you will need to opt out and then put those backed up folders back and everything will work peachy.
Yup, you want to backup the fs-base and fs-base-ui-pages folders BEFORE you opt in to SU11. If you revert back to SU10, you will need to opt out and then put those backed up folders back and everything will work peachy.