White space under footer

[JFry]

I seem to be lurching from one problem to another!

I have a sub-folder of my main site which is password protected Members' Area. The main site pages are fine but I have just noticed that there is white space under the footer of the members' area section. As I have only just noticed, I don't know when the problem started and what I may have done to cause it.

I have found various suggestions for the cause of white space but I haven't been able to correct the problem.

Can anyone help please? I have attached a screen shot.