I doubt it's the wallet. No code in the part that registers the wallet has changed. Also, many masternodes are running 2.1.1.0 already.
It's probably the collateral that is wrong in some way... Remember, it has to be exactly 30k swipp.
Also, check the debug.log... If it's not starting you can usually get some tips there.
Yours, team swipp
still see my IP.