Hi ,
Just to make sure I am understanding your setup, you should only be able to turn the character/camera when the middle mouse wheel is held down. However, once you middle mouse wheel is click and then released, you can’t reactivate it to turn the camera again?
I duplicated your setup above in the 1st Person template and it is working for me. Please let me know if I am misunderstanding anything.
If this is right and you still have having issues, could you include a test project that has the issue?