Well, there's always next year. Armadillo switched out the old engine on Mod and installed an engine from Pixel but at startup the engine experienced a rapid disassembly event. There was some brush fire but the vehicle looks OK.

The debriefing hasn't occurred yet so don't know if they have an idea as to what happened. The earlier problems were being ascribed to the fast turnaround between the two flight legs, which they had not practiced with the same time constraints. The short intervals may not have given time for the residual fuel to dry out. Crystallization could have led to the fuel line blockages, resulting in the hard starts when they began the final leg of the event.

More links:
* Fire ends rocket prize quest - Cosmic Log
* Hard start finishes Armadillo - Personal Spaceflight
* Second Sunday Attempt - Transterrestrial - includes photos