I have similar setup to you although with win10 and audiobox presonus usb96. And I had the same problem, here's the fix:
1) For others reading, make sure you download that "universal control" for windows--it is separate from studio one and recognized the presonus hardware when you plug it into USB. You'll be in windows configuration h*** trying to get any levels on tracks otherwise.
2) The Fix: In studio one, click on the "Studio One" pulldown on top and choose "Options". Now make sure you are on the "Audio Setup" (picture of a speaker). Then on Audio Device, change it from "Windows Audio" to "Audiobox" (it should have a pulldown picture of your audiobox when you click on the device to change it). I did not have to fiddle with the block size.
Why it happened: When you open studio one without the audiobox plugged in, it will probably revert to "Windows Audio" again. This seems to be the case for me.