QB Issue Resolution:

You can only change many of the preferences in single user mode. The way to do it is to run QuickBooks Mac client on the same machine as you have the server. Quit the server. Then launch QuickBooks mac and connect directly to the file. Then you can change any preference you want.

Once you are done, quit QuickBooks Mac and relaunch the server. All the preference changes will be propagated to other clients as they connect.

Resolution for Issue 'Just updated to 2014 and I am unable to log out of multi-user mode in order to change preferences.' available: Yes (Solved).
Source: Intuit Community forum.

Just updated to 2014 and I am unable to log out of multi-user mode in order to change preferences.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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