As the title says, I can't seem to be able to change the cover (or even remove the currently set one) of a project I already created... any clue? :D

I'm using itch from the browser (Opera/Chrome)

Can't imagine what's going on, I published a new project less than 24h ago, and everything worked fine. Let's wait on more feedback.

I'm talking about changing though, not setting when creating a new project... I wanted to change the cover image of a project but the "replace" button seem not to save the operation :(

After pressing the "replace button", did you also press the "save page"  button to save the so modified page? It happened to me once, I forgot to save the page.

Hope this helps.