I recently upgraded to version 4, and since then downloading files makes my browser freeze. I have confirmed NOD being the culprit because I turned off NOD and downloads would run as usual. Even if I try Firefox in safe mode while NOD is actively running protection, the freezes still occur so it's nothing to do with my browser or extensions (it happens in Opera, IE and Safari as well). The freezes happen either just as the "save file" dialogue box comes up, or as I hit "save file" or just after the file finishes download. It's very annoying. Windows XP SP3 running: Virus signature database: 4003 (20090412) Update module: 1028 (20090302) Antivirus and antispyware scanner module: 1206 (20090409) Advanced heuristics module: 1092 (20090309) Archive support module: 1092 (20090324) Cleaner module: 1040 (20090401) Anti-Stealth support module: 1010 (20090302) SysInspector module: 1211 (20090325) Self-defense support module : 1005 (20081105) I never had these problems with v3.