New terrain tiles Update

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Have you tried with vanilla YR to ensure it is not a patch issue? Have you tried creating a copy of the map and deleting any/all trigger and team related stuff as well as all placed units to ensure one of them isn't crashing the maps? You need to apply a far more scientific process to your troubleshooting or you will constantly be starting over whenever you encounter a problem because your current techniques will be insufficient to narrow it down enough to resolve it. You might also want to consider starting to save revisions so if an error crops up, you can start reverting things back to earlier versions until the problem goes away again. As an extreme, if you keep running into problems like this, you may need to start writing a journal of what changes you have made so you can roll them back. Labour intensive perhaps, but less so than constantly having to restart and thus making little actual progress.

Edit:
Another point just occurred to me, why are you using a patch at all when you are editing the terrain, you don't need any patch feature for that. You should develop as much as possible in isolation from the patches to ensure they aren't introducing new errors.