My environment: Windows 7 Enterprise, Service Pack 1 Internet Explorer 9, Version 9.0.8112.16421 Apache 2.2 PHP 5.4.0 MySQL 5.5.22 AutoIt 3.3.8.1 My two line script: #include <IE.au3> $b=_IECreate("http://localhost/ost/index.php") Generates this error: It has also failed at Line 549 and line 625 with the same message It is like the object goes away and then comes back at some point in the loop while the IE UDF is checking for the document to finish loading. A workaroun