Well, I downloaded 7.40b which I already had done. Prior to installing it I checked the programs and noticed another version of the codemeter software. So there was two versions, one older. I uninstalled both of them, then reinstalled 7.40b. I ran a couple of tank range engagements, and it froze again, but this time for only a fraction of a second or so. One tank range it did nothing at all. Now you might think that it is a hardware/harddrive issue, which is possible, but I don't think so. I have never experienced this behavior before.