For me to be able to provide you with the right issue resolution, could you please tell me what is the report name did you try to pull up in QuickBooks 2015? Or can you send me a screenshot for me to have a better view of the issue?
You may want to try to run and pull up the Journal report.
Click Reports at the top menu bar.
On the drop-down list, click Account & Taxes then choose Journal.
Click the Customize Report button.
Go to the Filters tab.
Search and select for Name.
Choose All vendors.
See some screenshots below.
I look forward to your reply. I'm here to help you out.