I have a strange bug(and no, there is no log). I can't seem to open chests after a few minutes in the game. Removing either foamfix or optifine solves the problem. There are also terrrain generation problems specifically with water or other tile entities. These are also solved by removing one of the aforementioned mods. The first few chests I open have no problem, but after a while they become unopenable. The animation plays but nothing happens and they become stuck like that. I also have betterfps and texfix.

My guess is the fault is at optifine, based on similar bug reports(optifine plus other mods produce this same bug), but it is thought that the newer version of optifine solved this. I guess newest optifine+newest foamfix=bug. This probably is a bug on their side. Great mod btw.

Removing texfix or betterfps from the combo doesn't help, btw.

Have you tried to look deeper into which smaller combination of the four optimization mods causes the issue?