Are you talking about the deck plans here on the Encyclopedia Titanica site here: Titanic Deckplans
I tried them and was able to view every deck. At the top of the page is a button where you can download the plans. Try downloading then and see if you can open the file and view all of it.
I had and still have similar problems. When I wanted to look something up a few days ago not all decks were showing up. Also here in the forum, I see there are new messages but when having a look it show only old ones and not what was posted today.