Please see the bug report guidelines - it's by far quickest to deal with and most likely to result in a fix if you can provide a minimal project as the bug report guidelines suggest, and they include tips on how to reduce a large project to a small one. If you cannot follow the guidelines please note it may end up taking weeks or months of back and forth before we even understand the problem.
If you absolutely cannot find a way to reduce the project and still reproduce the issue, please still file an issue following all the guidelines as closely as possible, but instead of attaching the project, email it to ashleywqs@scirra.com.