Make sure to select Tekkit 3.1.2 in the launcher under Manual Build Selection! We just released Tekkit 3.1.2 today so of course, we are now running it! Mostly a bunch of bug fixing. Here are some changes we implemented with 3.1.2 that you can expect to see: IC2 Machines should no longer appear sideways! IC2 crops should no longer become invisible! The donor world has been wiped! All axes should now chop down trees instantly (Yes, this took way too long to fix! Sorry!) Jetpacks are fully enabled! Tons of other little bugfixes! Enjoy guys.