I too am having the same problem: XP, Zone Alarm (version 9.2.057.0000), and no problems with my paid version of Malwarebytes until the upgrade to 1.60 yesterday. The computer I've tested functions in Safe Mode, but freezes at the end of the login process for any user, including the administrator, in the regular mode. (We have two others I haven't turned on yet since Christmas, but all are XP with Zone Alarm.) I ran a full scan of my computer in Safe Mode, using Malwarebytes 1.60, and it came up with no problems. So I'm not infected. I didn't upgrade Malwarebytes manually -- the program did it by itself, so using the clean feature wasn't needed. I uninstalled Malwarebytes and re-installed it using the 2010 executable file for Version 1.46 which I had on my computer. It has updated the virus signatures, so I have a current database on it (911122901), but still using engine 1.46. I have disabled updates for that, so it's a temporary fix. I have NO NO NO intention of stopping using Zone Alarm, whether it's up to date or not. You can't get me to dump someone else's product because your upgrade doesn't work with it -- without telling me in advance what it will no longer support. I'll stay with engine 1.46 for now. If it isn't resolved in a few weeks, bye-bye Malwarebytes. Too bad after all this time, on 3 computers, but I can't live with the lack of professionalism, attempts to minimize the problem, and excuses I see here. You guys might stop attempting to minimize the problem and the implied put-downs in your responses. I saw the same thing about 18 months ago when I last had a problem and visited here. It's not attractive. You'll come across as less arrogant and less defensive if you stick with the technical solutions to the problem, rather than trying to minimize it. It does nothing to increase my confidence in your product -- previously very high, now shaken.