Hi, i installed version 1.3.1. Many thanks for implementing synchronization. I have tested yesterday about 1 to 2 hours, and found it fairly synchronous, but not perfect, meaning that height of the cloud layers and cloud density were similar on all 3 networked machines, but there were significant differences in the precise location and shape of clouds. However, i had played with the configuration sliders on the different machines, and i had the idea probably small differences in the settings may cause the observed inconsistencies. So today i copied the "settings.dat" file from my main machine to the two others to achieve exactly the same settings everywhere. I just had a short flight, about half an hour, and clouds where almost perfectly synchronous. Looks like you made it;). I''l test more and let you know if i encounter problems. Now that it seems to work, i'm considering to buy more licenses to install on my 2 remaining machines. For that, do i simply order once more, and you open up 3 more license slots on my account? Is that how it works? Thanks Joe