I have newest Version installed 1.5.3. No Login:
www.fernsehservice-fischer.de/indexentw.htm

Local (Windows) is function.

dmxpageeditor.php:
// --- Change this only when using user security ---
$userName = "fischer";
$userPass = "66543211";
$ftpUser = "";
$ftpPass = "";
$ftpServer = "";
$ftpPort = "21";
$ftpFolder = "";
$ftpUsePasv = false;
// --- end changes ---

jQuery("body".dmxPageEditor(
{"activationKey": "ctr+f2", "editDreamweaverRegions": false, "editableRegionsList": "edit", "actionUrl": "dmxPageEditor.php", "currentPage": "/indexentw.htm",...

I've made the update from pageEditor, developed a new page, everything is transferred. The http login works only locally with Windows but not on the server with Linux. Several browsers tested by several PCs. Now I have tested the AJAX-Login and this works.
I can not login in all Demos from you eg: www.dmxzone.com/demo/php/ahe3demos/GadgetsStore/index.html (not found).(Carmen Gemany, excuse english)