image library and editor not loading and saving

Hello,
This has been a problem previous to the 3.9 WP update, which is getting worse and I can’t find a solution in the forums. So apologies if there is one thread already about this. I couldn’t find it and I spent a long time searching (even more that to find the “start new topic”). Anyway, my site is https://www.contramare.net it’s a bilingual site. The problem is when I am on the editor. What happens often, is that when I save it often goes to a blank page and when I return everything is gone. This is happening everytime I try to save something, not just once in a while, It really is becoming a time consuming issue. When I load pics from the editor, also doens’t load the pics. I have to exit the editor and go to the media option to load the pics. Finally, every since the update, the full screen editor doesn’t load. Can anyone please help me, I’m t the verge of giving up completely after spending a year learning how to put a site together. I’m really desperate ??