I am running 1.12 software with no problems, my slimer mech has improved greatly from 1.10 where it wasn't very responsive.
And another vote to change the mass hysteria reverse flippers. It is very annoying having it reverse back with no notice whatsoever and then to go back to reverse mode again. Like it has been mentioned before use a noise or the red out lane lamps to alert you.
Otherwise I am very happy.
For those of you still running 1.05, you are missing out on the "don't cross the beams" video mode and seeing some of the extra modes since it easier to progress through them.