'Error compiling program CS2001: source file 'left' could not be found.
As far as I know there is no source file called 'left'. The strange thing is that it compiled fine yesterday and I've made only minor changes since then??????
Which version of Basic4ppc are you using?
There was a bug in one of the previous versions that files weren't merged correctly if there was a space in their name. Change the name of 'arrow left key.bmp' and it should work.