[sp1nzoK]

Yeah shame about the glitch in your game. Some guy used godmode cause Dr. Fetus was being so slow that the saws came before he did. But since your problem is that he doesn't fall into the pit at all, I'm not sure if godmode trainer would do anything. Possible fixes (you have tried one if not all, but just listing them anyway):
-Super Meat Boy launch options -lowdetail (or manually setting low resolution etc.).
-VSync on (if it's forced off by something global then it will screw you up).
-Monitor refresh rate 60hz for Super Meat Boy (if it's forced to something else by global it will screw you up).
-Forced windows xp sp3 compatibility in Super Meat Boy.exe properties.
-Try the aforementioned things in both windowed and full-screen.

Beyond that only Team Meat would know and I guess they are only reachable in twitter.com/supermeatboy since I mailed them with something and no reply so far and on twitter they seem to answer some people.

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I started using different characters for better times now - did ch1 light so far. Naija is disgustingly sick and "easy to spam" fast times.

Glitch worlds are easy, I think I'd rate them from hardest to easiest: -5, -3, -1, -4, -2, -6.