The following JavaScript error is happening in Internet Explorer 11 when loading the posting.php page:

Line: 114

Error: Unable to get property 'indexOf' of undefined or null reference

The debugger states that the error is happening in plupload.js on line 114:

		if (form[i].name.indexOf('attachment_data[') !== 0) {

			continue;

		}

Might need to be brought to the attention of the plupload developer(s) or fixed separately in phpBB.