Either I've done this and forgotten or managed to miss it all these years:
Got a G2 with I and J for centre, blending to a G1 through an R3 corner rad, controller doesn't like the R3 after the I/J which seems obvious as it looks like i'm controlling the G2 with both I/J and R?
(cutter on outside creating island, G41 crc)
Cheers,