Hey,
Running 1.9.1
Getting the "please wait" box spinning forever when trying to add an item to a category (note the item never adds).
This is the debug;
Failed to load resource: net::ERR_EMPTY_RESPONSE
@robtsmith88
Please check the file system.log or exception.log file avilable in Magento Root > var > log folder.
You will know the reason for the issue.