Did this originally show up in the 2d panel view? If so, open your panel.cfg file and scroll down to the bottom. Check this section and in particular, the last line. If it's a smaller number, like 2145 or 3156, change it to what is shown here (only the last line). Save and restart the sim. See if that helps.
[Default View]
X=0
Y=0
SIZE_X=8191
SIZE_Y=6143