In loadpanel.js modify line 186 as follows:
Original line:
else if (!lpanel.loadElement.document.isLoading
&& (lpanel.loadElement.document.readyState=='interactive' ||
lpanel.loadElement.document.readyState=='complete')) {
Fixed line:
else if (!lpanel.loadElement.document.isLoading &&
(lpanel.loadElement.document.readyState=='complete')) {
This will remove the check for a readyState of 'interactive' which is true before the file has completed
loading.