Removed nopiclock.js. The trick of that particular script is that it silently disables right mouse click, though it seemed to disable all mouse clicks, which is counterproductive to say the least.
It may also have been in conflict with
<img src="../img/image.png" onmousedown="if (event.preventDefault) event.preventDefault()" oncontextmenu="return false;"/>
as right-click and drag is disabled anyway on images.
Will have to test a bit more when I have access to a PC with IE (working on Mac).