After I updated to 1.4.1 (from 1.3.9), everything works except the Visual Editor.
No error message appears either. When I click on 'edit', the loading bar appears briefly and then nothing else happens. From there, I cannot go directly to edit source, nothing happens. However, using edit source directly works.
I use the Timeless skin, so I thought that was the problem. So I switched to Vector as a test, with the same result.
Does anyone have any advice on how I can fix this?