There must be a JS script, that hides the element, as when DOM loads it looks this way:
- Code: Select all
<img src="http://www.forumcallcenter.pl/images/banner/750x100.gif" alt="Comarch Contact Center" width="0" height="0" style="display: none !important; visibility: hidden !important; opacity: 0 !important; background-position: 750px 100px;">
It is hidden from view, and its just a coincident, that on some browser it still stays visible (perhaps it is browser dependend script).
I would suggest to try testing unpublishing and publishing again of each 3rd party extension and module that is not joomla core module - after each unpublishing - please reaload the page and check if banner shows correctly.