I am having same problem with your MSColumn3DLineDY.swf.I set istrendzone=1 or 0 but no trendzone or line is render, just a label.
Example:
[trendLines] [line startValue='70.00' isTrendZone='0' parentYAxis='S' showOnTop='0' valueOnRight='0' color='669900' displayvalue='Goal 0.00 %25'/] [/trendLines] [/chart]