I think I've somehow broken my easy debian setup

I noticed I couldn't get LXDE to start. It would simply show the zenity dialog for kb focus and remain blank with an x cursor.
trying to launch any other app gave me an error:
eg

$ debbie pcmanfm

pcmanfm: error while loading shared libraries: libgdk-x11-2.0.so.0: cannot open shared object file: No such file or directory

I'm guessing a recent package that I installed has broken something
any ideas or should I just delete my image and start again?