I found that several applications would cause it to go crazy (lock up), including many Java applications and open office. Further, if you started adding many extensions, they would cause crashes (I'm sure it's because they were badly written, but I thought the whole point of haskell was no crashes).

So, if you find nowadays Java apps and openoffice work fine (or, you don't use them), and you are careful about which extensions you add, then you will probably be fine.

Oh! I know what you are talking about and remember the issue. You had/have to add `setWMName "LG3D"' to the configuration since versions older than Java 7 don't include Xmonad on their hardcoded list of suppported window managers. Correct me if I'm wrong, but it doesn't seem like that one was Xmonad's fault.

Interesting, to be honest I don't really use any extensions. I do use Java apps and openoffice these days and they work fine.

Thanks for your response! I'll have to try adding some extensions and see what happens.