I visited the museum yesterday, June 13, 2008, and they had the 3rd Floor roped off. I hadn’t read your entry and didn’t ask to go up, but was disappointed when I saw it “closed”. I also arrived at 1pm and they closed at 2 so I didn’t have much time.
From an American’s perspective, I didn’t find the museum that spectacular, which was disappointing because I had been very excited to see it. I understand why there weren’t many explanations in English, but I felt as a whole, things weren’t explained that well or clearly labeled (aside from the first floor area in the back with the ruins from the temples) in any language. It was also very empty when I was there (of people that is) but its very likely that was because no one else was as foolish as me to go only 45 minutes before they closed for the afternoon.
I think it would’ve been a better experience for me if I had done some better research before going in.