Hi Luoy,
I deactivated all other plugins, I update everytime when there is an update, so there was nothing to update. The problem is still there.
Maybe it has something to do with a js script on my homepage. Because my twitter widget, directly from twitter and the widget from Jetpack doesn't load. Before the page is completely loaded you can see a second that the twitterfeed is there and when the page is completely loaded the widget is empty. I'm not an js expert and also put this problem by the developers of my theme framework.