How to Resolve QuickBooks Already Has a Company File Open Issue
When you attempt to start a second company file in single-user mode, you get the message QuickBooks Already Has a Company File Open. Usually, it happens because QuickBooks is stuck in a background operation or because the settings are incorrect. This problem can be fixed by restarting the application or switching to multi-user mode. Give a QuickBooks specialist a call at 1.855.738.2784.