Hi, I noticed that you have an old version of the "CalendarToolbar.js" file, which is in "public/assets/javascript/og". This is what throws those errors in the calendar.
Maybe when you upgraded you missed copying some folders. For example, the readme.txt file says that you shouldn't copy the 'public/files' folder. Maybe you misunderstood or misread this and didn't copy anything in the public folder? I think it has something to do with that. Anyway, overwriting your files with the files in the OpenGoo 1.0 RC3 zip file (except for the config and upload folders) should fix it.
If this doesn't help please ask again and I'll have another look.