I'm right in the middle of testing, just manually entered a load of spins and clicked auto submit then got the error:
Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
So it crashed their development server. And that concludes today's testing. It doesn't surprise me as there is a lot that goes on when that button is clicked, but it should be able to handle it no problems if everything is coded correctly. What probably happened is a processing loop is created which overloaded the CPU.
Anyway they're working on it. Fun and games with development. Like I said before, no program is ever perfect the first time - especially complex ones.