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Since you are reading this, OpenTTD have crashed. This file tells you how 

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to fix the most common problems or make to make a bug report, that the 

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developers can use to track down the problem

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If it is an assert, OpenTTD will open the console for you, if it is truly a crash, you have to do it yourself. The Console is located at /Applications/Utilities/Console.

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The problem is near the button of the page

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The problems are as follows:

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NOTE: build from source means to download the source and compile 

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yourself. If you get one of the build from source error with the version 

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that is downloaded on a dmg file, you should make a bug report

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--Didn't find a needed file:

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	you just give it the file it asks for. It even tells you what 

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folder it wants it in

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	most common version of this problem is "Error: Cannot open file 

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'data/sample.cat'"

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	if you get that one, that means that you haven't got all the 

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needed files from the WINDOWS version of TTD

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	or if you build from source, 

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--Error: No available language packs

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	you need at least one .lng file in your lang folder. This applies 

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only to people who build from source

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--spritecache.c:237: failed assertion `b'

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	you got an outdated grf file. Update from the data folder in the 

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source. This applies only to people, who build from 	source

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--assertion error that are not triggered by one of the errors listed in 

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this file:

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	you most likely found a bug. Write down the assertion and try to 

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see if you can reproduce it. If you can, make a

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	savegame from just before it happens (autosaves are useful here) 

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and post a bugreport with it on sourceforge

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	Write what you did to trigger the bug and what assertion it made