The window opens (all white) and after a couple seconds it closes, with no error message. Already uninstalled and installed again and restarted my PC.
Is there a way to download Tiled 1.1 again?
EDIT: Fixed by deleting the registry entry for Tiled and reinstalling 
I managed to open Tiled by renaming the folder of maps I was working on (so it doesn’t try loading it as soon as I open Tiled) but now even creating a new empty map crashes it. I can create a new tileset though without crashing
Could you try with Tiled 1.2.0? https://github.com/bjorn/tiled/releases/tag/v1.2.0