It was tough not posting here for almost a day, but now that I got one of Ahribar's requested MIDIs out of the way, back to my "new favorite toy" I come.
So, the news:
Wild 15: sadly, it looks like 48/50 might not be achievable on the Mac. Why? Well, recall how I said on the PC, there are 3 different ways you can handle the final obstacle and get 47/50.
Well, on the Mac, it turns out that two of the ways doesn't work. The only method that works is the glitch-free, "guest-inspired" method. And no one has yet successfully adapted that solution to 48/50 at this point, so until then the best you can do on the Mac is 47/50 (which I still haven't confirmed on the Mac btw).
You might think that it's the steel area at the final obstacle that's causing the problems. But actually, the failures are not caused by the steel. For details, e-mail or PM me a solution and I'll tell you exactly how and why it fails on the Mac.
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Havoc 10: 17/21 confirmed on the Mac. Though interestingly, I needed to modify the solution to get it to work on the Mac. In fact, for a while I was almost going to give up and declare a 16/21 for the Mac version.
What happens is, on the PC version, if you have lemming #1 mine at a certain location and make #2 a floater as soon as he appears, it's possible that when #2 catches up with #1, #1 has mined down just enough to allow #2 to past thru the first trap without triggering it.
But on the Mac version, possibly due to subtle differences in the high-resolution terrain-removal mask for the miner, that doesn't work; I can't get #2 to not trigger the trap.
Fortunately, what save the day is another PC/Mac difference. Recall how, when I discussed the PC solution, I said using a digger is not suitable for carrying out the blocker's role for the miner glitch? Well, it turns out on the Mac version, unlike the PC version, you can also use a digger to carry out the miner glitch, besides using the exploder as in the PC version. The digger will turn immediately into a faller without removing any terrain.
This in turn leaves an exploder unused, which you can then use later in the solution to release the crowd. This in turn frees up a digger you can use in the beginning. I then used it by having #1 dig 4 times before mining. With that, #2 is able to get past the first trap without triggering it.