Hi Pete, 
I have a Windows7 Ultimate 64bit FlightSim PC with FSX. FSUIPC and WIDEFS fully registred on that machine. 
On my remote PC (Windows Vista) I have installed WideFS. 
When I start WideFS on my romete PC all works fine with connections e.g. FSCommander,FSEarth, Multiplay, etc. Also I see that WideClient is connected (Top of FSX window) 
But.... I have configure WFS also for button-use. Below you will see my WideClient.ini file. 
; PLEASE SEE WideFS documentation for parameter details 
; ===================================================== 
[Config] 
Port=8002 
Window=18,-2,886,576 
Visible=Yes 
ButtonScanInterval=20 
ClassInstance=0 
NetworkTiming=5,1 
MailslotTiming=2000,1000 
PollInterval=2000 
Port2=9002 
ResponseTime=18 
ApplicationDelay=0 
TCPcoalesce=No 
WaitForNewData=500 
MaxSendQ=100 
OnMaxSendQ=Log 
NewSendScanTime=50 
Priority=3,1,2 
[buttonScreen] 
Size=4,5 
0=T"Pause" 
1=T"Slew" 
2=B"Load Flight" 
3=B"Save Flight" 
4=B"Load Plan" 
5=Ba"ESCape" 
6=Bt"Cursor\rUp" 
7=Ba"Home" 
8=B"End Flight" 
9=Bl"Cursor\rLeft" 
10=B"Stop/Clr\r(Num 5)" 
11=Br"Cursor\rRight" 
12=B"Restart\rFlight" 
13=Ba"ALT\r(to get to\rFS menus)" 
14=Bb"Cursor\rDown" 
15=Ba"End" 
16=B"Return" 
17=B"Space\rBar" 
18=B"CowlFlaps Open" 
19=B"CowlFlaps Close" 
20=T"Pitot Heat" 
21=T"Anti Ice" 
22=Tltb"PushBck On/Off" 
23=Ba"PushBck Stop" 
24=Btb"PushBck Nose L" 
25=Btbr"PushBck Nose R" 
26=B"Change Aircraft" 
27=B"KneeBoard" 
28=B"Fuel & Payload" 
29=B"Realisme Set" 
30=B"Time and Season" 
31=B"Select Airport" 
32=B"Select Weather" 
33=B"Scenery Library" 
34=B"Track\Multiplayer" 
35=B"Follow\Multiplayer" 
; ----------------------------------------------- 
[user] 
ButtonScreen=Yes 
Log=Errors+ 
!Background=C:\Program Files\Wide FS\screen.bmp 
; =============================================== 
[sounds] 
Path=C:\Program Files\Wide FS\Sound\ 
Device1=Primair geluidsstuurprogramma 
Device2=Luidsprekers (Conexant High Definition SmartAudio HD2) 
Device3=Luidsprekers (3- Avnera Audio Device) 
BUT............... while all looks fine: Buttonscreen is correct etc, pushing the buttons result on no effect on FSX. 
The WideClient.log file shows: 
********* WideClient Log [version 6.86] Class=FS98MAIN ********* 
Date (dmy): 12/10/11, Time 14:13:22.492: Client name is ADPC02 
     1063 Attempting to connect now 
     1110 LUA: "C:\Program Files\WideFS\Initial.LUA": not found 
     2031 Server = ADPC01 
     2031 Trying TCP/IP host "ADPC01" port 8002 ... 
     2031 ... Okay, IP Address = 192.168.1.105 
     2047 Connection made okay! 
Please can you tell me what I'm doeing wrong? 
Kind geards, Ad