Hello.I have three different custom built machines with old, updated Windows XP Pro. SP(2 and 3) that have ATI Radeon video cards (9600 AIW, 9800 Pro AIW, and HD 4870) and ATI Catalyst drivers and its Control Center (latest to the old legacy versions).I noticed sometimes they won't/didn't security lock correctly from their defined screen saver's times. Even press winkey+L does not lock. I did see winlogon.exe running in XP's Task Manager. The only way to fix this problem is to reboot the computer.Is this a known issue and is there a way to fix it without rebooting like restarting winlogon.exe process? It seems like this is related to ATI video cards and its drivers in XP Pro.? I never see it with XP systems without ATI video cards like NVIDIA and onboard Intel video chipsets. And yes, I scanned for malwares with multiple updated softwares. They all showed my systers as clean. Event logs don't show anything about winlogon.exe.Thank you in advance. :) Ant @ Ant's Quality Foraged Links (http://aqfl.net) and The Ant Farm (http://antfarm.ma.cx).1 person needs an answerI do too