My problem is similar to the known issue that watering cans do not notify you when they break ( http://www.glitch.com/forum/bugs/5447/ ) but mine doesn't break (it says "0/500" and the watering can and when I try to water it says "You need a working watering can.") and therefore, also no notification but not just my watering can -- also my hoe has the same problem and I think all my tools have the same problem.
Now I can't do my Water Water Everywhere quest :(