Forge error/bug! Entire game crashes!

I was just forging around for a few hours and when I got back to my map and tried to grab an object, my whole game crashes!!
It will just bring me back to the Xbox Dashboard… I tried it several times, and the same thing happens over and over again…

It also looks like everything is grouped into 1 object all of a sudden :S
Does someone else encounter the same issue? Is there a fix?

PS: If you want to re-create the issue, open my map “BTB Test 01” and try to grab an object.