
That's a strange one rubenv.
That's the latest Mango version rubenv, have you tried long holding the Now app (in your app list) and pinning it to your home screen again ?
Pop into settings and make sure you have weather ticked to enable the live tile.
(3 screens to the right of the first screen you see after loading the app, settings is at the bottom)
Sections / Then pan right to Live Tile
No idea why you should be seeing the old tile if you have uninstalled the app previously.
Welcome along to WPC. :)