It has never happened before and has happened TWICE today !
If you imagine the 14x14 basic grid, about 3 or 4 squares down on the far left hand column - the square just locks itself
You can't walk through it, you can't roll anything through it .. it's behaving like the X symbol (but it definitely isn't)
Neither level is big, one is just 14x14 and they're not particularly busy with lots of objects. The only thing I've done which I perhaps wouldn;t normally is use the whole grid as floor space - i.e. without a wall round the edge ... maybe that's it
Any thoughts folks ?
Kazza