If you have Railcraft and pixelmon both installed, any client interaction with their ranch block causes a client-side hard crash.

Logs please.

http://pastebin.com/nPtyVvZH

We have other mods but we've pulled each in turn and only ever have this issue.with Railcraft.

Pixelmon dev here,
seems to occur on this line
drawBlockOverlay(tessellator, block.getSelectedBoundingBoxFromPool(world, x, y, z).expand((double) f1, (double) f1, (double) f1).getOffsetBoundingBox(-d0, -d1, -d2));

getSelectedBoundingBoxFromPool actually is null when using railcraft for some reason, also the te seems to try to render the overlay before it is initilized when using railcraft, strange.

I haven't the slightest clue. Don't see how anything I do could affect that.

Weave added null checks our end but it is still odd how this only occurs with railcraft installed.