Hi, we are trying to support all possible distro/WM combinations. Scientific Linux is not currently in our supported distros list. See this article for more information:
That said, to allow us to check what’s going on we will need full set of logs from server side. You can attach them here or send them to issues[at]nomachine[dot]com .
Additionally, please list the X server running on your server, you can do it by executing:
# ps axuwww| grep X