Hello, Obviously I must be missing something because since I had to reinstall FS about a month ago, I simply cannot make it run in the flawless way it did in the last years. When running on 2d panel, the sim stutters or lags whenever I left-click on the panel image or the outside view. It hangs for like a second and then resumes. Every time I click on the panel. I also get some flashes whenever I open/close 2d windows or select side views. I tried to install FSX on three different machines with completely different hardware, including different GPU models and brands (two of them running Win 7 and a brand new one running Win 8), and I observed the same issue on all of them. I´ve been trying to track down the source of this problem for more than a month but I´ve run out of ideas and still don´t have a clue about what´s going on. Any help will be really appreciated. Best regards Marc