No traffic after installing Traffic X

The most likely cause for this is if you have previously installed another A.I. traffic program that uses an old style .bgl (the file that acts as a database for A.I. traffic movements) as FSX is only capable of supporting one of these files in the old format and it will disable any other traffic. Please try searching your FSX directory for anything that may have been left behind by a previous A.I. program.

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and this ...

 

..... then you may have an old FS2004 format traffic database still installed into FSX. FSX is only capable of running one legacy BGL file from older versions of Flight Simulator and having one running will cause ALL other AI traffic to be suppressed including river/sea traffic and Traffic X. If you have previous used an AI program in FSX that does not use the a proper FSX format database please ensure that you have uninstalled the program. If this does not resolve the program then we have put together a tool that will search any and all folders being referenced by FSX in order to locate any old style .bgl files.

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The tool they are referring to can be downloaded from the FAQ page.

 

Also make sure you have the Traffic X Service Pack installed.  You can do this even if you are not sure if it is already installed.  It won't hurt anything if you install it over the top of your existing install.  You can download it from the FAQ page as well.