Numbers (iWork '09 V. 2.3(554)) opening multiple files-Yosemite (10.10.1)
I have a Mac Mini (early 2009) running OS X Yosemite (10.10.1), with iWork '09 version 2.3(554) installed. The issues that I'm currently having, is that when I open a single numbers file, multiple numbers files open in preview on the task bar. I try to close the windows but this usually causes numbers to crash. The only solution that I have tired is turning on, 'Close windows when quitting an app' and restarting the machine.
Any advice would be greatly appreciated.
Thank you!
Mac mini, OS X Yosemite (10.10.1)