it would help us a *ton* if can you try running, from a terminal:
chmod +x ./path/to/app.app/Contents/MacOS/NeoCityExpress ./path/to/app.app/Contents/MacOS/NeoCityExpress
that should generate a crash.log in path/to/app.app/Contents/MacOS (it seems that app bundles in mac intercept exceptions before I get a chance to generate the log file, so executing it that way should give us something)