The good news is I have fixed the My system functionality on the forums.
The bad news is you will need to re-enter your information if you want to include it in your profile. It should also now remain off and not in a user's info area if it isn't filled in.
As a result of fixing that though, the Xbox Live profile broke as well. So I am afraid you will need to re-enter this again.
Apologies for the issues caused, I hope you can appreciate I only did it because parts of the profile broke in the upgrade
Matt.