Ortho tool randomly stopped working on only one map project file?

Hi guys,

I'm currently working on tracing a map from a very large JPEG, and to make it easy to follow my progress I generated a grid and am splitting my progress up by each individual square. That was a few days ago - just today I thought the grid was a bit too small and wanted to make it bigger, so I went to the grid generation tool and tried to generate a new one, and did, but then changed my mind and thought I'd leave it as it is.

Since then, the ortho tool (to draw lines perfectly straight) has ceased working - toggling it on and off has no effect. In other map files it still works fine, so I assume the problem is with the specific project file I'm working with, which I have attached. Would anyone know of a way to fix this?


Thanks!


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