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The Coral log file is overwritten every time you attempt to start Coral. The log file is in a file named .coral-log . Because the filename starts with a period, normal directory listing commands will not display the file (on linux, filenames starting with a period are normally hidden from view). You can use the -a flag on dir or ls to also list files and directories whose names start with a period.
All Other Computers
In addition to sending CNF IT staff the error message in the popup dialogs, you will want to send along any additional Coral Java debugging information. To see this information, you need to first enable the Java Console on your computer. Please see this webpage for instructions on enabling the Java Console.