I have a command block that repeatedly changes the weather to 'clear'. /gamerule commandBlockOutput was false. When I loaded up 13w39a then it repeatedly said "Changing to clear weather." I typed /gamerule commandBlockOutput false and it kept saying "Changing to clear weather" when it was not supposed to.
Duplicate of MC-32673 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.