Christian, Libraries will change. You will have to update your code. This is inevitable unless you want us to freeze everything. If you're still on 6.10.4 you need to expect problems soon anyway. Few package authors support more than three compiler versions (and many only the one they're using themselves). If you want to hold off upgrading your code you can put an upper bound on the package dependency in the Cabal file (you should do that anyway). If someone changes something, assume that they do so for a reason. Don't so yelling on the list that someone should change it back just because you say to. Ask: "I see that X changed. I'm curious about the reason. Personally, it gives me problem Z and I would like to know if having Z is necessary." Working with the libraries process is annoying enough as it is that I don't really feel like also having to deal with people second guessing all the decisions we make. Johan