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Hi Paul, Thanks for your reply and suggestion. It was indeed an 'As Administrator' problem. I am deeply ashamed that I bothered you with this problem as you described this exact solution on here before. I did try changing the 'Run as administrator' settings to make them all match before I asked for help, but I must have been distracted and had forgotten one. Sorry, and thanks for your excellent support! (I know where to come if I struggle and need more help :D) Joris

Hi Captain Dowson and Captain Henty! Thank you for your contributions to our FS experience! I have recently started exploring the FSUIPC SDK and unfortunately, I could already use your help, as it seems that I can't manage to get Paul's client to connect with FSUIPC. I have no idea whether this is an FSUIPC, a FSUIPC client, or a .NET problem, so I hope that this is the correct place to ask for help... When I start the VB.NET client with FS not running I get error #2 FSUIPC_ERR_NOFS (as can be expected). When FS is running whilst starting the .Net client I get error #12 FSUIPC_ERR_SENDMSG (as a result from loading the form). Am I correct in thinking that this means that the running FSUIPC has been found but the client cannot communicate with FSUIPC? When the form is loaded, the "Connect to FSUIPC" button is NOT disabled (as it should be after a successful connection according the code), but clicking on it results in error #1 FSUIPC_ERR_OPEN indicating that the connection to FSUIPC is already open.... Could any of you two gurus please point me in the right direction to search for a solution? Thank You very much. Joris. I suspect the problem could have to do with my system configuration: - Windows 7 (64) - FS2004 - FSUIPC SDK release 29 - FSUIPC version 3.98 (properly registered) - FSUIPCClientExample_VB v1.3 transferred to Visual Studio 2008