Hey there,
Yes I did have a look. Here's the situation... Looks like you have one of the Macs with the Broadwell chipset and the Intel GPU.
On this particular hardware we are explicitly not enabling the DX10 code path.
The reason for this is there is a host-crashing bug that Apple did not fix for OS X 10.10 on this hardware.
The good news is that it is fixed in 10.11, so if you upgrade the Host OS, DX10 should work without having to do anything else.
Unfortunately, it does look like we missed this in the release notes, totally our fault and apologies for that!