Here are the three files. If I initialise and then step singly it works completely as expected. However, if I initialise and then run that is when we see the duplication in the display frame. My system info is: Microsoft Windows 10 Pro Version 10.0.14393 Build 14393 X64 JAVA jdk1.8.0_31 The pause does not work as yet but will do in due course. Kind regards, Stewart. On 27 January 2017 at 18:35, Sean Luke <[log in to unmask]> wrote: > 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. > > Sean > -- EMAIL DISCLAIMER http://www.york.ac.uk/docs/disclaimer/email.htm <http://www.york.ac.uk/docs/disclaimer/email.htm>