I have the same issue.
I had/have VJoy installed prior to the installation of the Infinite Screen Extension (ISE) software. My version of VJoy is 2.1.6 (x64/x86).
It seems that the VJoy dll bundles with the ISE is version 2.0.5 – quite old. Could this be the source of the issue?
I’ve tried replacing the Tobii installed VJoyInterface.dll with the x64 version from my install and received the “failed to connect” error. When replacing the Tobii installed VJoyInterface.dll with the x86 system version (2.1.6), I don’t receive the “failed to connect” issue, but I still have no working sticks in VJoy Monitor.
I see a stick bound to device 1 that is x/y, but no activity shows on this device.
GazeTrace works fine.
Other devices configured on VJoy work fine (My SpaceOrb360, on Device 10)
All Vjoy Devices display an error in vJoyFeeder – vJoy Driver (version 0000) does not match vJoyInterface DLL (version 0216) – Though my other vJoy devices function in-game fine.
I’m running Win7 with the newest versions of EyeX and ISE.