Hello, please do not panic! First of all, clean your browser's cache and try again and see if it is ok now.
Did you have any problem when upgrading the version? If you did, what error was it? What does your log say?
To which version have you updated yours? The latest stable version is 1.7 as 1.7.1 has just been released in order to test it, and several bugs have already been found and already are being fixed in order to release a new version as soon as possible.
Anyway if you have backed up your database before updating your version as I suggested you to do, you should have no problems since you could always go back to a previous version and try again!
Best,
Francisco!