rules stop working

[Misha279-UA]

sometimes, some rules just stoping working, i had world with sand, whater, rock, fish. i made that sand and water fall into water and air, but sand slide only into air, when i realised it, i took out air's, added water, and put them back, but now sand can't slide anywhere!
i think it happens when you changing active rules without turning tham off

on this screenshot i created sand, then i added whater and changed falling rule without turning off, and now it just not working (sand is on a ground becouse of sliding)

[TodePond]

heya, next time this happens, please can you press Ctrl+S or Cmd+S and send me the downloaded file, along with a screenshot? then i can fix it :)

[TeraByte-Official]

Try removing all the cells and then replacing them. That usually works.