Comment 2 for bug 607605

I accidentally "solved" the problem.I use orca,turn all the “universal　access”　on，I found that when using orca and Screen keyboard,the screen seems to be reloaded,and when these two things on,synaptic will crash.When start orca from terminal,after several interval settings,terminal will crash at the last moment,and I have to restart orca,then screen will be reloaded as it flashes.The flash also appears when using screen keyboard from "universal access",and turn off the keyboard will flash the screen again.So it seems that the screen keyboard and the screen reader/orca are the problem,turn them off temprorily untill bug fixed.