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I think I see what's happening. If you're in relative mode (G91) you can't draw circles.

FAIL:
>>> G91
>>> F100
>>> G0 X0 Y2
>>> G2 X0 Y2 I0 J-2
ok
ok
ok

But GRBL is on my Arduino - I'm just switching between different PC software which both send "G2 X0 Y2 I0 J-2"

OK, the circle code works in UniversalGCodeSender but not in GrblController 3.6.1

I thought these programs just send GCodes to the machine so how can they get different results??

Yeah... doesn't work on my machine (running GRBL).

The first command works but the circle doesn't and I get:
error 33 for G2 X0 Y5 I0 J-5

I'm new to CNC having built a 2-axis plotter driven by Arduino, CNC-Shield and GRBL 1.1.

I can draw a square.

I now want to draw a circle and have failed miserably for days.

I have googled...