@dave r said:

I've seen this sort of thing before but it has nothing specifically to do with this plugin. The same sort of thing might happen if you use a simple arc to do the roundover. This must be a pretty tiny radius corner and it appears you are running up against SketchUp's tolerance settings. One option would be to scale the geometry up by a factor of 10 or 100 and proceed with what you're trying to do. The other would be to delete the curves at the end of the roundover and draw in the lines to complete the corner.

Thank you. I had not considered that. I suppose I should have posted this elsewhere, then. It is a small part. Those planes are 1mm thick, and the corner has a radius of 0.25mm. I'll try scaling it up and back as suggested. Thanks again!

Has anyone else had trouble with edges of planes that have had RoundCorner applied? I have a model that I unfortunately need to temporarily undo the rounded corner in order to make other modifications to the plane. I thought it would be as easy at re-drawing the corner and using Push/Pull to apply that across the whole edge, but Sketchup refuses to redraw the corner correctly.

Take the following images, for example. Here I attempt to use the rectangle tool to create a nice new corner. However, as soon as I click to create the rectangle, the lines I need are distorted. The same occurs if I create guides and use simple lines. It appears to be impossible to redraw the corner!

Any ideas on what I can do?