Second monitor does not work, period, under mavericks.

[jgatl]

Originally Posted by jgatl

+1. I am using a display port adapter from apple (DVI connection) and the USB eVGA UV Plus+ 16 adapter. This was working fine before, with 2.1, I get no picture on the 2nd monitor. The displayport adapter is working fine.

Found out you can work through an external USB hub, but you need to unplug that USB hub from your mac and then plug it back in. Displayport will then work through the hub (as will everything else)