Please copy the contents of ForgeModLoader-client-0.log and paste it here: http://paste2.org
Then provide the link here on the forum so we can take a look at it.
The same goes for any crash-reports you may have.
I am actually having an issue when trying to load any world, it fails to load and takes me back to the menu screen, if I try to create a new one, or open the other one, it freezes the game, but no crash report is generated.
From reading it, it appears to be an issue with tropicraft.
ForgeModLoader Client log:
http://paste2.org/nF4YBC8d