Hi again Guys & Ladies,   I'm still reading the forum info and will try not to repeat previous questions.  In advance - - - I wish to express my thanks for your help. My question is :    When flying a regular small plane after a few minuets ,  the plane and scenery will start to  "FLICKER"  and parts of both will start to disappear.  It looks like a fanned out deck of cards.  My frame rates  often stay pretty high - - -  15 - 20 fps. Thats pretty good for my PC. This never happens with my three ultralights that I fly 99% of the time.  My PC is :  A Gateway Micro tower /  Windows XP Home Edition / Processor :  X86 Family 15 / 1799 Mhz /Pentium 4 CPU 1.80 GHz / Total Phy Memory 768.00Mb /Available Phy memory 507.82 Mb /    And I have 29 processes after re-booting   because I dont know which to shut down.         This old [71+] caveman  has a lot of catching up to do.   I'm on page 177 at this time and hope I didn't miss it.   Thanks again for your help.      caveman