No they didn't Matt. I was speaking with the tech at demon tweeks and he said when you change the software it will chuck up a load of errors which you clear and they shouldn't show again. Fingers crossed it won't show again!
Seemed to... I stopped on a clear stretch of road with the handbrake off first. Floored it and it accelerated as normal.
Then I stopped again and put the handbrake up one notch. Floored it again and got loads of wheel spinning under acceleration. Big difference.