On my iMac after I upgraded to version 8.x I have been unable to complete a scan. I have around 4.3 million items. What happens is the scan quits in the middle of a scan.
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I tried to do a custom scan of just my Machintosh HD. It seemed to be working fine, but ended up quiting before it finished and it still says "this scan has never been completed". I do think it stops scanning when the computer sleeps, but in this case I continued to work on the computer so it would not sleep. It was running in the background, but just now when I checked on it again, the program had quit again without finishing. I'm very discouraged about this. With the last virus protection program that I owned I had it set up to scan the whole drive every night in the middle of the night. It worked every time and it didn't matter that the computer was sleeping.
I tried to do a custom scan of just my Machintosh HD. It seemed to be working fine, but ended up quiting before it finished and it still says "this scan has never been completed". I do think it stops scanning when the computer sleeps, but in this case I continued to work on the computer so it would not sleep. It was running in the background, but just now when I checked on it again, the program had quit again without finishing. I'm very discouraged about this. With the last virus protection program that I owned I had it set up to scan the whole drive every night in the middle of the night. It worked every time and it didn't matter that the computer was sleeping.