If you see the interface is frozen or looks oddly, but there are no error messages on the screen, then check the browser console for error reports.
- To detect a server error please follow the Advice 3.
Set the proper error reporting for your PHP interpreter:
- set the
error_reportingto a high level (I recommend
E_ALL | E_STRICT).
Switch Magento 2 to the developer mode.
See Magento error reports in the
Generally, you can see 2 files there:
system.log usually contains a lot of low-level information and I do not think a generic administrator is able to properly analyse it.
So I recommend to see the
If Magento 2 runs in the production mode (not developer mode) then it does not show the actual error message on the screen, but shows a generic message:
There has been an error processing your request and creates a detailed error report in the
var/reports folder. You can find the error report file there by its report ID which is shown on the screen.