Hoo boy, do I have some good news.
Although I can't get 3DOPlay to run I can access the source code. And I'm trying their changes out now!
Now, don't get your hopes up too much, but at first glance this seems to have solved at least the Gex and Street Fighter II freezes! I can play Gex again! I'm sure there are more improvements.
The bad news it that their changes seem to have have brought along quite a few new issues. I know that some of their fixes are specific to Doom, for example, and I imagine the hackery it involves has payed a toll on other games. However, I am hoping that I can identify which changes are good vs. bad (trial and error if nothing else).
What a score! I feel like I've found Davy Jones' locker!
That problem's tied to Gex? Gex just happened to be the first game I felt like trying out, and when it froze, I was worried how good the emulator really was and just haven't brought it up since...Thanks for taking away my worry, and damn, keep up the great work on 4DO!