Most people use 3DSMax to make their flexes, which can only export them as separate VTAs, while Blender will export all flexes into a single file.
On topic, have you tried setting up the eyes to use two different materials?
Set it up so that the left eye uses “agent_whistler_eye_left” and the right eye uses “agent_whistler_eye_right”
Make sure you do this both in your modeling program and in the QC. If you only change it in one place, you’ll hit an error.
Try increasing the x axis for the eye position, like this:
The right eye should become more negative, and the left eye should become more positive. Just keep adjusting them until the eyes are in the correct position.
eyeball eye bone x y z
eyeball righteye "ValveBiped.Bip01_Head1" -1.57 -2.21 66.96
eyeball lefteye "ValveBiped.Bip01_Head1" 1.17 -2.21 66.96
Well, if faceposing doesn’t work the flexes are probably broken, or the VTAs don’t actually have any information. Make sure they’re all in the correct position in your model viewer and try exporting them again.
I can’t really say much more than that.