Add the steps involved:
Open your browser's console:
|Browser||how to open the console window|
hit on an Apple MAC / OSX or click on the browser's menu on the top right, select menu item "Tools" and choose sub-menu item "dev. tools"
|Mozilla Firefox||use the free add-on "FireBug" (you have to manually install this add-on into your Firefox)|
|Microsoft IE10/11||hit keystroke "F12"|
3. Select tab "Network", which can vary depending on your browser and have a look for AJAX-calls not resulting in HTTP-200 (= okay) and provide that information, too.
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