Theme – Sight

Dear All,
from some days I’ m fighting with a strange problem. Up to a certain page it stored images in uploads/2013/12/image.png and it worked normally, suddenly with no apparent reason it stored images in uploads/2014/05/image.png and the related page visualize nothing.
I’ ve tried to change everything, writing the content of a functioning page but, with the same result….
This is really strange cause from that moment I can not visualize the content of new pages starting, from the 5th….
Can you give me a hint to fix this problem?
Thank you very much for your kind cooperation