This Clock seems to be way to fast for the command block. Should produce a Output "hi". Other "ultra fast clocks" aren't working too. F3 view also says "triggered" while watching the command block. Runs once at connetion.
Environment
Java 8 64 Bit, Windows 7, 4GB Ram, i5 460M
Duplicate of MC-11189 - 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.