On Jan 27, 2017, at 4:44 PM, Stewart Aitken <[log in to unmask]> wrote:

> If I step the sim it looks as expected, when I run it I can see duplication inside the Display frame. A secondary console counter is shown one step behind the primary console. Also, a Grid is shown underneath the primary one out of synch by two grid lines. Strange!

Ugh, it looks like yet another Java environment bug, tickled by something MASON is doing that's probably perfectly legitimate.  :-(  Can you tell me what OS, OS version, and Java version you're running?

> Re the Border edges, I can get them up to ObjectGrid2D( 45, 40) after this they just do not appear.

Get me a revised version and I'll try it out on my Mac and see if it happens here as well.