This is a really old block (like 1.5 or before) but I had the same problem and solved it.
I thought that was it, but see if this helps you at all.
package draco18s.micromods.peephole;
import java.util.List;
import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.Entity;
import net.minecraft.util.AxisAlignedBB;
import net.minecraft.world.IBlockAccess;
import net.minecraft.world.World;
public class BlockPeepHole extends Block {
public BlockPeepHole(int par1, int par2, Material par3Material) {
super(par1, par2, par3Material);
this.setBlockName("Peephole");
setHardness(1.0F);
setResistance(5.0F);
setStepSound(soundStoneFootstep);
setCreativeTab(CreativeTabs.tabBlock);
setLightOpacity(0);
}
public String getTextureFile() {
return CommonProxy.BLOCKS_PNG;
}
public void setBlockBoundsBasedOnState(IBlockAccess world, int x, int y, int z) {
int var6 = world.getBlockMetadata(x, y, z);
switch(var6) {
case 1:
this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 0.0625F, 1.0F);
break;
case 2:
this.setBlockBounds(0.0F, 0.0F, 0.9375F, 1.0F, 1.0F, 1.0F);
break;
case 3:
this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 0.0625F);
break;
case 4:
this.setBlockBounds(0.9375F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
break;
case 5:
this.setBlockBounds(0.0F, 0.0F, 0.0F, 0.0625F, 1.0F, 1.0F);
break;
case 6:
this.setBlockBounds(0.0F, 0.9375F, 0.0F, 1.0F, 1.0F, 1.0F);
break;
case 0:
case 7:
this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
break;
}
}
public AxisAlignedBB getCollisionBoundingBoxFromPool(World par1World, int par2, int par3, int par4)
{
return null;
}
public void onBlockAdded(World par1World, int par2, int par3, int par4)
{
super.onBlockAdded(par1World, par2, par3, par4);
this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
this.setDefaultDirection(par1World, par2, par3, par4);
this.onNeighborBlockChange(par1World, par2, par3, par4, this.blockID);
}
private void setDefaultDirection(World par1World, int par2, int par3, int par4)
{
if (!par1World.isRemote)
{
int var5 = par1World.getBlockId(par2, par3, par4 - 1);
int var6 = par1World.getBlockId(par2, par3, par4 + 1);
int var7 = par1World.getBlockId(par2 - 1, par3, par4);
int var8 = par1World.getBlockId(par2 + 1, par3, par4);
int var10 = par1World.getBlockId(par2, par3-1, par4);
int var11 = par1World.getBlockId(par2, par3+1, par4);
byte var9 = 7;
if ((var5 != blockID && Block.opaqueCubeLookup[var5]) && !Block.opaqueCubeLookup[var6])
{
var9 = 3;
}
if ((var6 != blockID && Block.opaqueCubeLookup[var6]) && !Block.opaqueCubeLookup[var5])
{
var9 = 2;
}
if ((var7 != blockID && Block.opaqueCubeLookup[var7]) && !Block.opaqueCubeLookup[var8])
{
var9 = 5;
}
if ((var8 != blockID && Block.opaqueCubeLookup[var8]) && !Block.opaqueCubeLookup[var7])
{
var9 = 4;
}
if ((var10 != blockID && Block.opaqueCubeLookup[var10]) && !Block.opaqueCubeLookup[var11])
{
var9 = 1;
}
if ((var11 != blockID && Block.opaqueCubeLookup[var11]) && !Block.opaqueCubeLookup[var10])
{
var9 = 6;
}
int var99 = ((var5 != blockID && Block.opaqueCubeLookup[var5])?1:0) + ((var6 != blockID && Block.opaqueCubeLookup[var6])?1:0) + ((var7 != blockID && Block.opaqueCubeLookup[var7])?1:0) + ((var8 != blockID && Block.opaqueCubeLookup[var8])?1:0) + ((var10 != blockID && Block.opaqueCubeLookup[var10])?1:0) + ((var11 != blockID && Block.opaqueCubeLookup[var11])?1:0);
if(var99 > 1)
{
par1World.setBlockMetadataWithNotify(par2, par3, par4, 7);
}
else {
par1World.setBlockMetadataWithNotify(par2, par3, par4, var9);
}
}
}
public int getBlockTexture(IBlockAccess par1IBlockAccess, int par2, int par3, int par4, int par5)
{
int var6 = par1IBlockAccess.getBlockMetadata(par2, par3, par4);
if(var6 == 0 || var6 == 7) {
return this.blockIndexInTexture+1;
}
else if(var6 == 6) {
var6 = 0;
}
return par5 != var6 ? this.blockIndexInTexture+1:this.blockIndexInTexture;
}
public boolean isOpaqueCube()
{
return true;
}
public boolean renderAsNormalBlock()
{
return false;
}
public void setBlockBoundsForItemRender()
{
this.setBlockBounds(0.0F, 0.0F, 0.4375F, 1.0F, 1.0F, 0.5F);
}
public void onNeighborBlockChange(World par1World, int par2, int par3, int par4, int par5)
{
//int var6 = par1World.getBlockMetadata(par2, par3, par4);
boolean var7 = canPlaceBlockAt(par1World, par2, par3, par4);
if (!var7)
{
this.dropBlockAsItem(par1World, par2, par3, par4, 0, 0);
par1World.setBlockWithNotify(par2, par3, par4, 0);
}
super.onNeighborBlockChange(par1World, par2, par3, par4, par5);
}
public boolean canPlaceBlockAt(World par1World, int par2, int par3, int par4)
{
int var5 = par1World.getBlockId(par2, par3, par4 - 1);
int var6 = par1World.getBlockId(par2, par3, par4 + 1);
int var7 = par1World.getBlockId(par2 - 1, par3, par4);
int var8 = par1World.getBlockId(par2 + 1, par3, par4);
int var10 = par1World.getBlockId(par2, par3-1, par4);
int var11 = par1World.getBlockId(par2, par3+1, par4);
/*if (var5 == blockID || var6 == blockID || var7 == blockID || var8 == blockID || var10 == blockID || var11 == blockID)
{
return false;
}*/
byte var9 = 7;
if ((var5 != blockID && Block.opaqueCubeLookup[var5]) && !Block.opaqueCubeLookup[var6])
{
var9 = 3;
}
if ((var6 != blockID && Block.opaqueCubeLookup[var6]) && !Block.opaqueCubeLookup[var5])
{
var9 = 2;
}
if ((var7 != blockID && Block.opaqueCubeLookup[var7]) && !Block.opaqueCubeLookup[var8])
{
var9 = 5;
}
if ((var8 != blockID && Block.opaqueCubeLookup[var8]) && !Block.opaqueCubeLookup[var7])
{
var9 = 4;
}
if ((var10 != blockID && Block.opaqueCubeLookup[var10]) && !Block.opaqueCubeLookup[var11])
{
var9 = 1;
}
if ((var11 != blockID && Block.opaqueCubeLookup[var11]) && !Block.opaqueCubeLookup[var10])
{
var9 = 6;
}
if (var9 == 7)
{
return false;
}
int var99 = ((var5 != blockID && Block.opaqueCubeLookup[var5])?1:0) + ((var6 != blockID && Block.opaqueCubeLookup[var6])?1:0) + ((var7 != blockID && Block.opaqueCubeLookup[var7])?1:0) + ((var8 != blockID && Block.opaqueCubeLookup[var8])?1:0) + ((var10 != blockID && Block.opaqueCubeLookup[var10])?1:0) + ((var11 != blockID && Block.opaqueCubeLookup[var11])?1:0);
if (var99 != 1)
{
return false;
}
return true;
}
}