Quickly looked at your logs -- lots of USB devices. Can't see your preamp though, but that doesn't mean anything
And yes WASAPI is crashing on playback
A windows config issue with their drivers, maybe ? Jumped on their site and saw this
http://emotiva.com/resources/media/xda2/How_to_rename_the_XDA-2_USB_device_driver.pdf which I find pretty strange.
The drivers load a device name SPDIF for a USB driver. Might want to check and even rename like they say and make sure you chose the right device. Also they say it "defaults" to Direct Sound so maybe there is a driver setting in properties advance tab? Just guessing on that one. As it worked via optical and coax its seems logical to me that its not on the jriver side.
Otherwise in MC, you can try Options=>Audio=>Audio Device=>You should have exclusive access checked already; try checking the disable event style -- I see you have some a nice setup but sometimes certain dacs require this so disregard the older hardware comment.
Lastly on version 18 I had to set my bit depth to 24 instead of automatic -- shouldn't make a difference but doesn't hurt to try. I don't remember if this is on the same device pop-up box or if this is set in DSP studio under output format but you'll find it.