I've been using FSX since the first month it was released. SP1 and SP2, but no other add-ons. My 3800 x2, 6600GT 128mb won't qualify for many of the add ons (like FEX), but with sp2 and the latest nvidida driver, I have really enjoyed the upgrade from 2002. Yesterday I tried my first FSX add-on, some better (?) AI with World of AI, and installed one airline--United. The install seemed to go OKI started FSX, and the first "transmission" was "United xxx, climb to..." I switched channels for my clearance, and proceeded to fly. On the short trial flight, no traffic except the regular FSX traffic, and not much. I had a CTD (my system suffers if I push traffic--55 commercial, 45 GA is where I run). Re started and flew the flight, but this time never heard a United transmission, and almost no others. Arrived at Louisville--and there was not a plane on the ground, none in traffic patterns, etc. Found I can put traffic to 100%, go to PHL, JFK,etc and there are no other aircraft (fps is better!!)I re-installed World of AI/ United ("it's already there"), let FS make a new CFG file, but I cannot get any of the AI back. I ultimately did an XP restore to a set point I made before I installed World of AI (I'm so clever, I thought...) World of AI files are gone from the Sim Objects file, but I still have no other aircraft/traffic (there goes the "clever" rating).I've searched the forum unsuccesfully for similar threads. Would really appreciate any thoughts. If all else fails, I can reinstall, Do I need to install SP 1 then SP2, or does SP2 alone suffice?Thanks very much. I rarely post, but read the forum several times a week. There is a core group on this forum that is incredibly knowledgeable and helpful to us computer-mortals, and I sure appreciate all I've learned from you already. I'm sorry if this is a recurrent issue that my searches missed.GaryGigabyte K8N sli pro mbAthalon 64 x 2 3800Gigabyte 6600 GT 128 mb2 GB RamXP home sp 2

Hi,Gary....I have recently gone thru the same thing..To begin with read this thread....Lots of good info....If this doesn,t help, re-post and I will try to...Louhttp://forums.flightsim.com/vbfs/showthread.php?t=160804

If you did a restore from before installing WOAI, chances are that the WOAI "traffic BGL" file is still present.Since the WOAI traffic bgl's are FS9 format ( created with TTools ),their presnce will inhibit FSX default traffic unless the WOAItraffic BGLs are run through one of the available conversion utilities.Check your SceneryWorldscenery folder to see if the default FSX filesare still there and remove any of the WOAI traffic BGLS if present.You should then at least get back to having FSX default AI and you canthen move on from there. Paul

Paul. Thank you. That got me back to the FSX AI. Orbit and Pacifica are sounding pretty good..Lou. What a great link, thanks so much. It looks like this really can be done, though maybe not on my machine. And not tonight A 14 hour day today, a 6am meeting tomorrow and another full day after that. One quick flight, then to bed.Gary