Can't click and insert files/images through MCPuk

Hi there,

I still can't find out why i am not able to click and insert files and images through MCPuk, whenever i click a file and try to insert it there's no respons. Nothing happens and the file is not being inserted into the page. I'm using TinyMCE aswel, but that seems to work properly. Does anyone know what this problem might cause?

Thanks in advance,
Peace,

Nick