Hello, I have been flying the MD-11 for a couple of months now. Yesterday, I tried to load up the MD-11 and upon selecting it in the Free Flight window, FSX crashes with one of those "fatal error" windows. This was after flying successfully earlier in the day and for months. I sometimes get an error about {smartassembly} needing to be on the computer. I have searched the forum and the web for possible fixes. So far I have spent three hours over the past day doing:- Uninstalling MD-11 and re-installing- Repairing FSX- Removing all Visual .NET frameworks (I can't get 3.5 to reinstall due to Windows 7 giving me an error saying "You must use Control Panel's Turn on and off Windows Components to install this" which I have tried turning on and off but to no affect- Removing and reinstalling Visual C++ runtimes- Doing all the above in various orders So far still no luck. All my other planes work including the PMDG JS4100. I am running Windows 7x64. The only thing I can think of that I did between working and not was installing FS Passengers demo which I have since removed. I am thinking it could have overwritten something but I'd think a re-install of the MD-11 would have that fixed. Any help would be appreciated. Thank you!- Richard

It looks like I may have fixed it. After some more searching, I came across this in the support folder: http://support.precisionmanuals.com/KB/a92/dllxml-information-and-troubleshooting.aspx In dll.xml there was a line at the end of the addon lists that had an open <Launch.Addon> with nothing inside and no matching closing element. I deleted that and it seems to work now. I'll keep my fingers crossed and keep this in case it helps others!