Update isn't working for me -- it says the current stable version is 425 (I'm now on r449). Do I need to completely uninstall and reinstall? And is there a way to reinstall without wiping out my database?
How did you get to r449 if you're running stable?
You can go into Edit Settings, then change the development branch from 'stable' to 'experimental', after which time experimental updates will be available to you