Just so we're clear, it crashes when playing and not when building. Correct?
All I can think of is to build it again and see if you get the same results. If you do, it's probably something in that level. If it crashes somewhere else, it's probably something in the build process. If it works, it was just a glitch in the matrix.
Also, when you say latest patch, do you mean Black Ice Mod?
If so, you can try going back to an earlier version and see if it works.
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