So you’ve hit upon a problem in SharePoint 2013. All the help articles tell you to have a look at the log file. But the SharePoint 2013 log file location?
Find that SharePoint 2013 log file location
The log files for SharePoint 2013 are located at:
C:\Program files\Common Files\Microsoft Shared\Web Server Extensions\15\LOGS
You can find out more about Configuring and Viewing SharePoint Log Files and Diagnostic Logging in this MSDN article