Costum Mobspawner and Gui API bring until newer Forge errors.
Tested with "all" versions for 1.4.6 higher than 480
For other mods arw higer Versions needed, there is a dilemma...
It seems, that DrZhark and ShaRose couldnt solve that problem.
Its easy to simulate, thats why I didnt put a error log here.
Like title say, tree sapplings could only placed over one block air between dirt...
only Forge 4.1.4.271 than OptiFine_1.3.2_HD_U_B3 are installed on Minecraft 1.3.2
New lokal world, single play, not server