Hello friends. Please, read carefully the report below, I hope to contribute something, or someone in similar situation maybe find a "mate problems." I'm not one of those virtual pilots who fly hours a day in front of the FSX. Unfortunately, personal and professional commitments allow me to fly only a few hours a week.So I don't believe that my story will help you find the solution to our problems. But it would reflect a little what I'm going through, and others can be. I have installed FSX as PMDG recommended, with updated drivers on a PC i5, 2600k, 4gb ram, nvidia 570gts. There is not THAT machine, but to date it has managed to fly like I wanted. I have a few addons, UT2, RC4, some freeware scenery, and PMDG airplanes, of course!!!!!!!!!!I run FSX on XP, because I got tired of the CTD and the stories of "put the automationcore here or there, or delete, etc. etc." in W7. And since I did it, never tried CTD again.Well, the day finally arrived, and the 737 NGX landed. I behaved like a child all day, waiting for the launch (and I've got 37 years!!!). I had no serious problem at the beginning, as some reported in this forum. My only problem was the freezing. Not having enough time to get testing and testing, I made short flights (KSEA-KPAE, KPAE-KSEA, KPAE-KBFI, SBGR-SBKP) just to feel the machine. And even in these short flights, quick flights, I experienced the freezing. Then came a hotfix (hotfix 1) and all improved. The freezing almost stopped. But I had to travel, and when I returned, 2 days ago, I saw that there was the hotfix 3. I installed, and regretted it. I have freezing on all flights, (those short flights cited up there), and I have CTD in some, while programming the FMC, before takeoff. In short, it was impossible to fly. I don't have much time to get testing, and I recognize that this is important. I simply make the adjustments requested by PMDG, even reduced some of the FSX settings, and when I find something valuable here in the forum, I try on my PC. But I, today, as "ordinary consumer", I am facing these problems. I'm returning to the hotfix 1. I believe that until we find more effective solutions to the problems, this is the best solution for me. This is not a criticism of PMDG. Quite the contrary. If the series 6 / 700 was launched today, I'd buy at the same time, even with all the problems we have faced in the series 8 / 900. Why? Because I have the MD11, the 747-400, the-8i, and I know the quality of PMDG products. These problems are transient, and although they are taking longer than we would like to spend, they will pass. In my opinion, there is no better company in this business. To all of you who spend hours a day trying to improve the NGX, I wish success .And my thanks for the effort. Excuse the grammar mistakes, English is not my native language. Best regardsCristiano Mueller

XP -- 32bit : You need 3 Gig switch, set to 2.5 Gigs = NO BRAINER Enough said.. ( unless you want to re-install W7 64 again) Geoff

I'm with you on this. I didn't really have any issues prior. to any of the hot fixes and ignored the first two. As I used the NGX more I noticed some little issues with the FMC when making big changes it would freeze. So I figured maybe someone has brought this up or the little tweaks made in the previous hotfixes would clean up these little issues and all woudl be good. Boy was I wrong. I went from 2 - 3 flights a day if not more to nothing. I couldn't get past the free flight screen before it CTD. Playing with it more I found the trusted options didn't look right and manually edited each one for the PMDG. which would re prompt me upon entering and actually allow me to get in the plane. Performance still wasn't right and the next time i loaded FSX I was back to square one. So for the last couple days I haven;t heard the purr of the engines. Tonight I took the dreaded plunge and unistalled FSX and all my add-ons. Let me remind you all how much time it takes to get the thing back to where it was. 4 hours later still no flight. It's amazing all the little tweeaks that need to be made here and there. Runway lighting, aircraft lighting (shockwave), addon scenery, cfg tweaks, ezdok install, etc, etc. The good news is I'm back to the orignal version and it seems to be working like it did prior. As for any future updates from PMDG - I'm going to wait until i hear what the general concensus is before i go through this again.