I have EFB SP4 installed and it made no difference to the no AI displayed problem with the NGX. Bruceb

Have you tried other aircraft ? Does this only happen to you with the NGX only ? As I posted above, I have seen this with other aircraft, and pre NGX.

I have EFB SP4 installed and it made no difference to the no AI displayed problem with the NGX. Bruceb

It won't - the SP was to cure 'the too many requests' error message.

Sorry to bring up an old thread, but I think I stumbled on a fix.Open simconnect.xml (located same dir as FSX.cfg.Back up first. <?xml version="1.0" encoding="Windows-1252" ?><SimBase.Document Type="SimConnect" version="1,0"><Descr>SimConnect</Descr><Filename>SimConnect.xml</Filename><Disabled>False</Disabled><SimConnect.Comm><Disabled>False</Disabled><Protocol>IPv4</Protocol><Scope>global</Scope><Address>192.168.2.4</Address><Port>6600</Port><MaxClients>10</MaxClients><<<<<<<<<<<<<<<<<Change this to 20 or more, depending on the number of addons that require Simconnect.<MaxRecvSize>8192</MaxRecvSize><DisableNagle>True</DisableNagle></SimConnect.Comm><SimConnect.Comm><Disabled>False</Disabled><Protocol>Auto</Protocol><Scope>local</Scope></SimConnect.Comm></SimBase.Document> Include addons that are on your FSX PC and client. I used 5X as a rule, so I have 4 addons that require simconnect (including NGX) so I put 20 in.Don't know if this will work if you use Vatsim client as I don't fly online, no harm in trying it.Result of all of this, is my ai ( UT2) do not disappear out of FSX and Avilasoft EFB anymore.