Alllllrighty then, I know that I've talked about FallingSand glitches before, but for real this time.
1. Download and open the test world
2. Fallingsand spawner should (sort of) work
3. save and exit
4. open the text world again
5. game crashes
6. cats and dogs in love
7. total pandemonium
What I think it is, is that the game fails to save the attributes of the spawner for some raisin.
This is most disconcerting.