Often when trying to run my GTK2HS application the first time with GHCi I get : panic! (the 'impossible' happened) (GHC version 6.10.1 for i386-unknown-mingw32): loadObj: failed Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug This only occurs when I forgot to set my current directory correctly; then GHCi gives an error since it can't find modules GHCi, version 6.10.1: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer ... linking ... done. Loading package base ... linking ... done. Boxes.hs:23:17: Could not find module `NM8.GUI.Layout': Use -v to see a list of the files searched for. Failed, modules loaded: none. If I then correctly set my current directory using the :cd command, and try again, I get the panic crash. When I start GHCi again and immediately set the correct current directory, it works fine. I haven't tried to isolate the problem, but maybe others have experienced this problem? It's not really a show-stopper, just but a bit annoying