I had successfully saved a mission and reloaded. Everything was fine. So, I logged out. However, I came back to edit it and it reverted back to an earlier save - removing several maps, dozens of objects, three costumes, and six objectives.
This data loss is very bad. Unless this issue is a server issue, I think Foundry needs to get pulled again.
This happened to me as well. I saved everything, and even successfully published my mission, but everytime I log back in to the Foundry, and edit that project, it says there's a newer autosaved version available which I know isn't true. So, I click "no" when it asks me if I want to load the auto-save, and the project is missing a bunch of objects that I saved and even published. So, if I want to correct a typo in my already published mission, I'll have to recreate all missing objects, fix the typo, and THEN republish.
I'm really happy with the interface, it's *reasonably* stable (not rock solid like the game, but certainly above average for a level editor, which are often wildly unstable) and am very happy with the range of assets and level of customisation available.
Being able to pop in and out of space or ground map quickly and easily at any point is awesome, as is the ability to assign actions to items as well as characters.
Unfortunately not being able to save changes means I'm going to choose not to test until that issues been resolved, as it's making it too difficult to do end-to-end testing and give more valuable feedback right now.