This just happened so I don't have full verification or details yet, but it's possible that there may be a compatibility issue if your DK PCB has a certain variant of the Z80 chip.
I don't know if this is common or rare yet. I have investigating to do.
If you have a Z80 chip labelled "NEC D780C" on your DK PCB, the Remix board may not function correctly.
The solution most likely is to switch the Z80 with a different one. My DK PCB has a "SHARP LH0080A Z80A-CPU"
Basically, I think anything that ends with an "A" will be fine. A Z80 chip with a number ending with a "C" might not be.
If people can check their DK PCBs to see how common a "C" type chip is, I would be extremely grateful. (especially anyone who's already waiting for their board to arrive)
If it's common, I'm going to maybe include a Z80A with each Remix board but it's going to delay things.
I'm sorry everyone. I'm going to do everything I can to fix this.