I had used a file called Trojan Simulator http://www.misec.net/trojansimulator/ to test Mamutu and other anti-malware software. Since I have Comodo firewall, I was asked by it if I wanted to allow the file to run. I okayed it (without allowing it to remember my action) and one or two more, so that it would run. Then, Mamutu kicked in and stopped the program from running. But now Mamutu is not blocking it, and I'm wondering if it's just my computer, on which Windows seems to be breaking down (honestly, I looked in Program Files, and there were remnants of at least fifty to a hundred programs I had tried and uninstalled. Next Windows reinstall, I Shadow Defender all new programs!) If anyone has a secure enough setup where this supposedly (?) harmless test program can be run to test Mamutu, I would love to hear from you. I don't know if a new version of Mamutu is to blame, or my failing Windows. I want to finish testing all the security software I'm going to use before my reinstall, so I don't have to play around anymore. I want Mamutu to be a keeper. I just don't know of any way to test it, unfortunately, except for that one program I heard of.