I have been getting this error latelty and i have noticed after i break the ps block the block is still place and have to break it again as well.

http://pastebin.com/ZQ9PSRd4 -error
http://pastebin.com/afp5BRJs - also found error in logs for /ps disable

Ps 9.5.4 cb 1.4.6 cb build 2571

http://pastebin.com/mADd1Dq7 - config

Should be fixed now