Okay, this is the second time I've tried to export a test model to Blockland. I was using SketchUp, exported to .dae, imported to Blender, exported to .dts.
Well, the game wouldn't pick it up in the addon list. I backed up the default rocket launcher and replaced the model in it with mine. The rocket launcher loaded, but when I set the brick to hold one, there was nothing above the brick. It still let me pick up an item (and the icon was an R in the items menu), but when I switched to it, Blockland froze and crashed with the usual "Blockland.exe has stopped working."
Is there a solution to this? When I made the model in SketchUp, I left it at its default colours and it loaded fine in Blender as well. I don't know my Blender version because the about box doesn't even show up, and I'm using SketchUp 7.1.
The console printed nothing unusual.