DisplayLink USB adapter wants to be the main display
 

Our current setup is an iMac with 2 external displays. One of them is using the built-in mini-display port and the the other is connected via the DisplayLink USB to VGA adaptor. The external displays are set up at 1024x768 (projectors).

When I startup the iMac, it boots up normally until it reaches the log-in screen. At that point the iMac display resizes to more of a 800x600 size. I have to use the keyboard to get to the User profile because when I hover the mouse to User icons the do not line up. Once logged in, the iMac display resizes to the correct size.

Does anyone know a reason why the DisplayLink (or perhaps the mini-display port) is over-riding the default iMac display at startup?

I've checked the Arrangements Preference. I've reset the PRAM. I've booted into Safe Mode and made sure the defaults were good.

Tim

Mac OS 10.10.5 / Latest DisplayLink Driver / ProPresenter 6