I've been a Logos user for over a decade and have always appreciated the advancements offered in the upgrades; until now. I installed Logos 4 this afternoon via download and immediately lost control of my computer. Logos seemed to take over the bulk of my resources, even when it was not running. In particular, mouse function was seriously compromised. It so negatively impacted computer performance that I did little else in exploring the new interface than discover that it appears I have lost many of the customizations that I have really liked about Logos 3. I've uninstalled the program and regained "normal" computer function. I'll try again when I upgrade my computer from the present configuration (Pentium 4.0 3.0 GHz with 3 GB RAM running WIndows XP) to a new configuation (Pentium QuadCore Duo with 8 GB RAM running Windows 7).