QuickBooks writes messages about what is happening in QuickBooks to a special log file, which we will call just "the log file:"
The log file contains QuickBooks messages, as well as information created by the Verify Data, Rebuild Data, and Condense Data utilities. It does not show General Protection Fault or Invalid Page Fault messages or messages or errors from other programs. New entries and errors are added to the end (or bottom) of the log file. The file includes date and time stamps with each log entry to help you identify the most recent entries.
QuickBooks for Windows generates a separate Qbwin.log file for each QuickBooks version within each QuickBooks user. Each time you start QuickBooks, it renames the old Qbwin.log file and creates a new one.
Navigate to the file path: C:\Users\YOUR USER NAME\AppData\Local\Intuit\QuickBooks\log\XX.X\qbwin.log
When you open the Qbwin.log folder, you will see the following:
To access the quickbooks.log in OSX 10.7 or Later:
If you are having issues accessing this file, click on the Access hidden user library files in Lion to find quickbooks.log
QuickBooks for Mac:
See Use the QBWIN.log to resolve data damage for next steps.