We have an Orbbec Astra Pro with the 2018 chipset, and the depth sensor does not always get detected by our computers, while at the same time the HD camera apparently does. Re-plugging the camera into different USB slots only works at random times; sometimes the same USB slot that didn't work initially suddenly seems to work after a handful of tries. Once it does find both sensors, the camera works as expected.
The funny thing is, is that this problem only appears with our 2018 model of our Orbbec Astra Pro. The 2017 version of the Orbbec Astra Pro does not seem to have this problem, and neither does the 2018 version of the normal Astra (without Pro).
We have tested this on multiple Windows 10 x64 machines, inlcuding the 1709 and 1803 updates.
Here is an image illustrating the problem: