For reasons that I won't go into, I have been using Sophos on Macintosh 10.7 Lion for rather longer than most people, and have had no problems. Following the latest update, I found that I had frequent frequent crashes with fairly banal applications used one at a time, Safari, Microsoft Office Outlook, Console, Terminal, with frozen screen, no access to menus, and the only way of shutting down being to hold down the power button. I noticed, when Activity Monitor was working, that Sophos was typically using around 78% of the CPU for things like updating, then failing to return the memory, resulting in up to 3.4GB of my total 4GB being in the blue "Inactive" area (as opposed to "Free"). Deleting Sophos resolved the difficulties, and current memory use is typically half of the total. I tried reinstalling, and the first crash came within minutes. I like Sophos, and have a "paid for" version running on my Windows virtual machine, but will not be using it on the Mac side until I have evaluated a future update.
Pity!
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