Using a Dell M6700 laptop and ViewSonic PJD5122 projector.
When the projector is connected the computer cycles through the projection options available in Fn+F8 / Windows key + P: disconnect, duplicate, extend and projector only. It does not stop cycling through these options and there is seemingly no option to disable this, making a presentation impossible.
Have tried all applicable diver updates, and screen resolutions options to no avail.