Hi, I was advised to report it here ... and maybe somebody who knows ghc better can reproduce it or knows what is the problem. I uninstalled all ghc, gtk, and gtk2hs packages then installed ghc 6.8.3 and then gtk2hs 0.9.13 on Windows XP 32bit. This should not be because of some stalled files from previous ghc as it was suggested to me. And I was told there is nothing strange in gtk2hs 0.9.13 to cause this. A version of gtk2hs 0.9.12.1 I compiled myself works with ghc 6.8.3. I did not try to compile 0.9.13. Any ideas? Peter. status:0 peter@dwarf [764] /c/tools/Gtk2Hs/demos/hello % ls Makefile World.hs status:0 peter@dwarf [765] /c/tools/Gtk2Hs/demos/hello % ghcii.sh World.hs GHCi, version 6.8.3: http://www.haskell.org/ghc/ :? for help Loading package base ... linking ... done. [1 of 1] Compiling Main ( World.hs, interpreted ) Ok, modules loaded: Main. *Main> main Loading package array-0.1.0.0 ... linking ... done. Loading package bytestring-0.9.0.1.1 ... linking ... done. Loading package mtl-1.1.0.1 ... linking ... done. Loading package glib-0.9.13 ... <interactive>: Unknown PEi386 section name `.reloc' (while processing: C:/tools/Gtk2Hs/HSglib.o) ghc.exe: panic! (the 'impossible' happened) (GHC version 6.8.3 for i386-unknown-mingw32): loadObj: failed Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug *Main> :quit Leaving GHCi. status:0 peter@dwarf [766] /c/tools/Gtk2Hs/demos/hello %