I stumbled upon a minor problem with a IC2, which is still quite annoying. No tool or other item (like jetpack) can toggle it's modes. I use the specified key (M and right-click), but that doesn't work at all. Here is the list of other mods installed aside from IC2.
Treecapitator
buildcraft
gregtech
ironchest
Railcraft
RedPower 2
Thaumcraft 3
Version of the client is 1.4.7. and all mods are for that version including IC2.
I wish you could help me or at least point out a possible source of a problem.