OK I think the issue should be fixed in the latest version of the game. Any items you didn't get won't come back, but if you start a new game it should work properly.
We haven't seen that issue before. I just uploaded a new demo build. Are you able to save/load the game normally? It sort of sounds like an issue with the save data.
We save the compressed PNG data for all of the paintings and when a painting gets far away we delete the Texture2D and only recreate it when you get close to the painting again.
It's likely that your ISP is blocking our website. A troll reported us and we are still trying to fix it. If you can log in to your ISP account and whitelist our website, the game should start working again.
i think the typing backwards is a bug when the game is full screen. You don't need to be logged in to paint. You can find an empty canvas in the main gallery
the web version is updated as well. If an upload doesn't go through it's possibly an internet connection issue. Hard to say. It seems to happen on unstable connections.