1) Make sure "retract on layer change" is off.
2) Also in PREVIEW mode, step through the extrusions one at a time and see exactly what is happening at this corner. Maybe even look at it with the repetier host gcode viewer. It's free and highlights every extrusion and movement with it's associated gcodes.
3) Do you have "coasting" enabled?
4) Is this happening right after layer change? If so maybe print outer walls last? Maybe you already are.
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GregValiant 1,455
That's a weird one and I haven't seen that before. Maybe @Slashee_the_Cow has seen something like that?
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