I have found a bug in 0.38 version, I have tested it on 0.37c and it doesn't happen. I attach a savegame to test it. To reproduce the bug you must only build one bridge slab in one of the two water squares located in the center of the screen that are surrended of another bridge slabs, inmediatly trying to do this, the game crashes. As I have said, this don't crash in 0.37c version.
I use Win7 64 bits and there isn't any error or warning in the log file