Can't draw straight line

This is a weird problem. Suddenly I am unable to draw a straight line along the guideline.

Attached are the SKP file and an animated GIF illustrating the problem.

What’s going on?

Can't draw lines
Double walls windows solar panel etc~.skp (206.1 KB)

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When I open the model you posted, it has a collection of edges at the place your video shows. Is your display driver up to date? Should the edges split the face that is behind them? In that case, open the group for editing before drawing. Or is the style in your screenshot one that has Edges turned off?

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Thank you. I selected the entire model & now it works.