I am trying to find a fix for this issue and I saw on a lot's of post, that people are having the same problem as I am with Adobe Digital Edition 4.0.3. If I open Adobe Digital Editions 4.0.3 with no book opened and I minimized the window, then it crashes and it give's me the following error message:
Please download the latest ADE 18.104.22.168585
Some of the crashes have been fixed in this release.
Thanks for being the part of product improvement.