In Merlin build 73 and 74 Graphics2D drawOval and drawLine method do not
render anything in the Canvas

To run the example

cd /net/summerpalace.eng/export/home/paulby/code/Merlin_Line_bug/src
merlin_bug.sh

The window titled 'Java3D Scene Graph' is the one containing the issue
(this is all 2D, other parts of the app use Java3D but not this window).

On Merlin build prior to b73 you will see a number of nodes connected by
lines, on build 73 and 74 the connecting lines are missing and the
outline of the non icon nodes is missing (drawOval)

Example added as an attachment