Due to the issues several people are experiencing, I am going to turn off all of the fancy coding I have installed (world map, uploader, pager etc), and run a default Template (skin) to see if this resolves the issue.
Im am sceptical this is the cause, as I have made no changes recently, and the site was running fine until 1 week ago. However to further the investigations this step is required..
Please do not be alarmed