Kicad 4.0.1 Version Switch canvas to Opengl issue

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Using kicad Latest version 4.0.1. In this Printed circuit board editor View toolbar Switch canvas to default and switch canvas to OpenGL mode available which is not in previous old version so what is different between this two mode??
We design Edge cut of PCB in Opengl mode and after generate gerbar file thare is change in line diamentation in gerbar.also same mode change to default edge cut of pcb change so i not understand opengl mode. please help to understood generate proper edge gerbar file using opengl mode.

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OpenGL = future
Default = legacy

Default is working and will be maintained for the time being, but no new features added.
OpenGL is sometimes buggy, but for example got the push&shove router functionality or arrays.

As for edge.cuts thicknesses in gerbers:
they are not meaningful, as the centre of the line is what counts on the edge cuts layer for the milling bit, not the thickness of the line.
Can you post pictures/files of your problem, just in case?

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Thanks to Reply.
Here Three file attach 1.Canvas as OpenGL 2.Default mode and 3.Gerber file
We design PCB edge using Canvas OpenGL mode shown in fig canvas as OpenGL after make edge complete check Spectra DSN no arror after generate gerber and show it there are some change in PCB edge shown in Figure gerber file indicate by circle.
how its change in garbar its complete connection in OpenGL…
After i try to design change in Default mode just click view Canvas to default same edge problem shown in Default mode image and also shock while check Spectra DSN no error but pcb edge not proper connect so why not receive any error in default mode…??

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1920×1080 197 KB

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1920×1080 241 KB

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1920×1080 254 KB

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If you right-click Select and go to Properties for each of the two lines that make that intersection, do they show a matching Start/End X-Y point? Sometimes when I have a curve connecting to a line at an odd angle, I have to manually edit one end point to force them to match. This is due to the odd angle not being an integer of the X-Y grid size. I do get an error thrown in this case however, before generating Gerbers, where you did not.