What exactly does it say? Is the screen black at first and there's a tiny message box informing you that it cannot read some file (like the .changes file)? If that's the case you might have several instances of the source code running in development mode at the same time. Another thing is, that if you're trying a lot of things in the source code your Squeak image might get bloated, so you might want to evaluate "Smalltalk garbageCollect" from time to time, or - better yet - file out your current changeset and file it into a "clean" image.
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