After all those SDBs, cabinets, wall segments and doors my construction tool needed a little TLC. After repairing it " just perfect" it wouldn't work. on anything. Refreshed, reloaded. nada... Dropped it. ( giving tools a good clang seems to wake them up) put it back in my inventory and we're good to go. Phew.
I'm reporting this here just to see if anyone else runs into a cranky construction tool.