I have two work computers and they always work well with synergy.exe before. Today I want to access one of them which is installed the windows 2003 server remotely from the other one installed windows vista, it doesn't work. According to investigate the eventlog and search google and finally I have figured it out. That's because that the windows 2003 server PC with a graphic card "ATI Radeon X1300/X1550", the simpler method to solve this issue is don't enable the hardware acceleration(Display-Properties-Advanced-Monitor), otherwise, please update the ATI Radeon driver.