I've been looking into Spider-Man game based on 2002 movie and its issues. Now, most people who played this game are likely aware of the issue with black screen softlock that happens in most training levels and some of the story levels. This bug has been fixed in 1.3 patch (attached) but there's a question that has been bothering me: what exactly causes this issue?

This black screen not just a graphical issue, the game breaks entirely - you can't move, sounds from every object in the level play at maximum volume, health bars for bosses that are supposed to be encountered at the end of the level appear immediately, in some levels you just die instantly and even without black screen some enemies fail to spawn properly. I've dealt with plenty of old games on newer hardware and I've never heard of compatibility issues causing weird shit like that.

Did anyone try investigating this bug? The official patch notes state that it occurs on "newer Pentium 4 processors", it presumably first manifested itself somewhere in 2003, shortly before 1.3 patch came out, but what is it about newer P4s that could break this game? At first I thought there was some race condition but looking at the game in IDA has shown that it doesn't use multi-threading outside of Bink FMV playback. Then I thought there might have been a change in extended instruction sets but this game doesn't use any x86 extensions outside of Direct3D rendering pipeline which must have been statically linked from DirectX SDK. It sounds like a floating point calculations issue, maybe a bunch of values like entity coordinates get set to NaN which would explain why you can't move and why you hear sounds from all level entities at once. But that doesn't get me any closer to the root cause so I'm at a loss here.

Out of curiosity, I tried using tools like MoSlo and those didn't fix the issue. Another person has also tried reducing FSB speed on an Intel Core 2 Duo CPU and that also didn't fix it even with clock speed reduced to the point of causing heavy framerate drops in-game. Makes me wonder if it really has anything to do with CPU performance or if it's caused by something else entirely.