Well yea, I noticed that as well, but it only started doing it every single time after adding mods like TC2, RP2, and Forestry, with just IC2 and BC 3.1.5 it didn't do it all the time and yea, I gave up on em as well since the real achievement is building what you want, not what it tells you to build~
Also, on the Optifine thread it states to install it last in the mods, and with ML it only seems to work when installed last. That was just a statement in regards to saying one has to install it in the jar when he's using it though. That said, maybe installing optifine smooth very last was causing the graphical bugs with the latest version of it and forge. All I know is that changing smooth for standard got rid of my flying trees, invisible creepers, and disco sheep with no legs.