Line with 2 arrows jumps to zero length in plan footprint?

[nicknz]

This is a plan footprint CAD detail created by clicking the plan footprint icon. I draw a polyline over the existing house footprint then draw a line across the polyline open the line dbx and check arrow on each end, the line length jumps to zero. I have had this happen on other plans. If I draw a line horizontally and add arrows its fine - if I draw an angled line not connected corner points on the polyline its fine - it only happens when the line is from corner point to corner point. OK just checked, it does it in the plan too. Is this something to do with the line wanting to become part of the polyline.     

[Kenoeightspot]

I am getting similar results, strange.

[nicknz]

Nice to know I'm not alone Bill - I can work around it anyone else tried it?

[DRAWZILLA]

Try turning off "auto position head and tail", I had to do that a while back b/c it was changing position on me for no reason.

[Kenoeightspot]

Just start with "Line with arrow" then add second arrow head.

[nicknz]

Both right thanks guys - can't see the wood for the trees some days