You can't kill the big swamp monster BEFORE reaching that Point, it has been confirmed that you should NOT use MEGADAMAGE in that part of the game, and it has also been confirmed that you have to START the whole chapter over and not just the checkpoint without the MEGADAMAGE option on. If you did not use the trainer i dont know, cleared the whole game without using MEGADAMAGE and i NEVER had any problem.
The log is there but I can only cross halfway and for some reason, I fall off every time.
I've never heard of that before, that's really weird.
... unfortunately you may have to start the level again.
like herpderp said
Don't use super damage in the trainer, because when you attack the big shrimp that appears earlier, and which is the same one that appears when you walk on the log, and you killed it the first time with super damage on, it WONT appear in the log scene, hence you stay falling off the log dieing, so reload to some earlier point with super damage switched off in the trainer , and try again, and this time all will be well.
[Edited by jackbig, 5/18/2013 8:43:54 AM]
BTW there are some more points in the game that has some similar
"Boss" problems when using super damage, so this also goes for this events when using super damage.
[Edited by jackbig, 5/18/2013 8:45:34 AM]
I believe I have come across two points where the SD causes that glitches. But no others so far. Spoiler: