The same problem. But I think some days ago it wasn't happenig.

1. 2013-12-20_00008.jpg - Church in Elektrozavodsk
2. 2013-12-20_00004.jpg & 2013-12-20_00005.jpg - one house in Elektrozavodsk

The same as:
0002018: Sunbeams go through montains and building
0002287: Sun visible through solid objects.

Is it here? - See screenshot - 2013-12-20_00001.jpg
It is Balota swamp. Pipe under some kind of bridge.
Have the same problem and the same sypmtoms - sinking into ground over and over. Now waiting to starve to death.