Having some weirdness with modes... figured I'd just post here since I'm sure Dave is checking the thread, and to share and see what others are finding.
Infected is disabled. Played a few modes in the game, finished superbeast and couldn't start a new mode after its multiball. Mode start was flashing but shots to the VUK would simply turn the robot and kick out to the upper playfield, where I could shoot and complete the rollovers, but that's it. I eventually started the G.OBER mode and finished it, then was able to start a left-orbit mode again. Picked American Witch and finished it, got the multiball and eventually drained out. Game acknowledged MB end ("That's it!") but would still say "shoot ramp/right orbit for jackpot." Now shots to the (lit) mode start would turn the robot, and score lightning bonus if lit, but no ability to start mode and ball sat in hole til ballsearch. Drained trying to start LDG to see if that would change anything.
Gotta say, despite the couple bugs, this code is a HUGE_ leap forward. Bunches of new features, almost too much to shoot for and keep track of, the sounds and grafx are much, MUCH improved.. shooter groove loops are seamless, tons more voices and effects, game filled with unique target/lane/bumper sounds to let you know what you hit w/o looking at the display (essential during LDG and modes) .. new grafx for lots of the features, much better scoring balance, good movement of Supers to eliminate ramp looping... and some massive knockers to boot. Not the replay variety either! This game is finally playing like it should be, and rates right along Stern's current lineup in terms of polish and quality. Don't hesitate to upgrade despite the issues mentioned here, it's WELL worth it.