ad d popup a4j:log and check request output.
Have you find a solution for your problem?
I am having this problem as well. If I have a rich:tree and am using the Chrome browser, as soon as the tree is rerendered the page goes blank. The tree will return on a page refresh.
This is the error that shows up in Chrome Dev Panel:
Uncaught Error: INVALID_STATE_ERR: DOM Exception 11
Also, the same behaviour is true on the live demo site:
Just drag and drop an img into the favorites node and watch as the tree disappears.
Chrome version: 10.0.648.151
Richfaces 3.3.3 Final