One could clearly see from the TV exposure that Obama is losing his patience. He is frustrated that no negotiations have so far taken place between Israeli and Palestinians. Rahm Emanuel probably told Obama that Netanyahu is a pushover,a very weak PM as seen from his previous time as PM when he gave in to the WYE agreement. This time however Netanyahu has been tough and has and will not give in over the settlement freeze, Jerusalem, refugees, etc. So, Emanuel has pushed Obama up a tall tree and he cannot get down. Moreover, all his pleas that the Arabs should show some concessions to Israel over the freeze has been met with total silence. Even the simple phrase "we recognise Israel as a Jewish State" has not passed the lips of any Arab. Thus, the negotiations are in the deep freeze, Obama together with the Arabs who he apparently loves, are up a tall tree and got stuck there. This means, that another warfare round is in the offing at any moment.
Israeli troops shoot, injure Palestinian crossing Gaza border fence (Haaretz)
from the article: Rahm Emanuel: Obama summit was not just a photo opportunity