How to find the console log:
1. Open the Console (located in Applications/Utilities/)
2. Select the 'Open Console Log' menu item in the File menu.
3. Select and copy the last relevant chunk of console log; they're sorted by date, so look for the day/time that roughly corresponds to when you were experiencing the bug (within a couple hours or a day is ideal). If you can't find anything from the day/time of your problem, try clicking the "Reload" button, and reload a larger portion of the log file (this is usually unecessary).