all the interiors i make in Torque Constructor my Blockhead can simply Walk Threw them like there not there.
There are three possible problems I can think of.
1. When you were making your interior, you used CSG. When it breaks your object into pieces it leaves atleast one of those pieces overlapping with another piece. Torque can't handle this so it screams at you in german and doesnt let the objects collide.
2. You have two objects colliding in some other way.
3. You didnt export correctly. To export correctly, save the file, close torque, reopen torque, load the file, and without changing the file beforehand export as a legacy dif.
If you can't fix the file you're working on, try exporting a simple cube.