They are having the same problems I'm having with GameMaker. It's an old application originally written for older Macs. As newer OSes come out, Apple no longer supports some old code, so you try to make some tweaks and hacks to keep it running. Eventually it no longer works on new Oses at all, so you decide to do a nearly complete rewrite in Carbon because it's an easier switch-over then going to Objective-C, plus it will run on older machines as well as new ones. When you get 3 quarters of the way completed, Apple decides that they are no longer supporting Carbon and all of the new code you wrote won't work in the future. So you now have to start all over again. I got tired of it.
Here's one example of what happened to me:
Most of the GameMaker alert and dialog windows were done in ResEdit. Apple dumped that and said switch to Interface Builder and use those windows, alerts, and dialogs. OK, so I spent a lot of time doing that for GameMaker 4. They look very nice and work well, so I felt it was worth the time and effort.
So guess what Apple did in OS X 10.7 and 10.8. They decided to no longer support the Interface Builder items that they told everyone to switch to. So now all of the windows I created I can't even open and edit in the new Interface Builder in OS X 10.7 and up. So now I'd have to start over again and redo them all including all of the code I wrote to handle the windows and what to do with the options the user selects, so it uses Cocoa Interface Objects. I just got tired of rewriting constantly and never actually able to get something completed.
And that's just one example.
