Hello there from Greece.
I have the problem that most of my large pages on my site on several times are hiding their content, like this one and this one.
I first met this trouble by putting some plugins like the +1/google. And for now i have the same trouble with puting on any plugin, even the supercache or some others cache plugins.
On this time, i use only three plugins: Google XML Sitemaps, Login LockDown and WordPress File Monitor Plus and the problem exists.
How can we fix it?
Btw, greetings and thanks for your job!
Sorry if my english is not so good.