Sticky Piston Updating Bug in SMP when it has a quartz Block attached

I was trying to make a 2x1 retractable door on a server using nether quartz. Everything was going fine, but the Sticky pistons that pushed the quartz wouldnt update, and wont extend or retract while the quartz is attached. When I used common blocks like cobble and stone, it worked fine. And when i broke the pistons, moved them to a different spot, didnt put on the Quartz, they work fine, but with quartz attached, it wont work.