Angular dimension "Lines are parallel" error

Hi,

I'm running DraftSight Version 11.2.802 on a Dell T3400 using Windoz 7 x64

Each time I use the Angular Dimension, upon selecting the first (poly)line it does not wait for the second line to be selected and shows the following "Lines are parallel." message

The Command window shows this:

: _ANGLEDIMENSION

Options: Enter to specify vertex orSpecify entity»

Specify second line»

Lines are parallel.

The work around is to use the Vertex option, but this is a pain

Any ideas?

Thanks in advance

Ian