USB3-SATA-U3 with ASMedia ASM1051e Chipset. MacOS 10.11 (El Capitan) on Macintosh Pro will not start up if the Plugable dock is plugged in - even if the dock is not powered on. Once the USB cable is unplugged from the dock the MacPro boots up fine.
The same MacPro had been working just fine with this dock before the update to El Capitan. Booting the MacPro from its backup Yosemite partition with the dock plugged in still works fine.
Here is a photo of the startup crash: