G76 problem ( i think !! )

[swdiver]

Hi all
Hoping some one may be able to help,
I'm running a small lathe with a cs-labs IP-S controller and Mach 3 turn.
I've only had it running for a few months and until i have learnt to use CAD + CAM software, to make parts i have been generating bits of code with the mach3 turn wizards and then manually editing them to stitch the various operations together.

Below is some code to cut a thread generated with the mach3 simple threading wizard , this runs fine direct from the wizard but if i save it in note pad and then reload it after running another operation it always stops after the first G76 pass at the point where the tool should retract and just hangs there with the lathe spindle still running.

G0 G40 G18 G80 G50 G90 (thread)
G00 G53 X0 Z-183
T707M6
G00 X7.35
G00 Z5
G00 X6.35
M03 S750
M08
G76 X5.1 Z-6.2 Q2 P1.27 J0.006 L45 H0.2 I29 C1 B0.0001 T0
M9
M5

Its probably obvious but what am i missing that makes it work from the wizard but not from my saved file ?

Below is the code i am trying to run before the threading operation , i'm aware this is rough and needs tidying up

G18 G40 G49 G90 G94 G80 ( start)
g0x20
g0z70
s1500
t1010
m3
g0x20
g0z0
g0x10
g01x0 f30
g0z10
G18 G40 G49 G90 G94 G80 (rough)
G0 X11.3 Z1
F90
G0 X8.1
G1 Z-6.24
G0 X10.1 Z-5.3
G0 Z1
G0 X6.9
G1 Z-6.24
G0 X8.9 Z-5.3
G0 Z1
G0 X6.47
G0 Z1
G1 Z-6.24
G1 X11.3
G0 Z1
F90
G0 X6.35
G1 Z-6.3
G1 X11.3
G0 Z1
G18 G40 G49 G90 G94 G80 (end chamf)
M3
G0 X8.3 Z1
F150
G0 X4.6834
G1 X6.7619 Z-0.8
G1 X8.3
G0 Z1
G0 X4.2453
G1 X6.3238 Z-0.8
G1 X8.3
G0 Z1
F100
G1 X3.8453
G1 X6.1547 Z-1
G1 X8.3
G0 Z1
G18 G40 G49 G90 G94 G80 (mid chamf)
G0 X11.5 Z-5.3
F150
G0 X7.8834
G1 X9.9619 Z-7.1
G1 X11.5
G0 Z-5.3
G0 X7.4215
G1 X9.5 Z-7.1
G1 X11.5
G0 Z-5.3
G0 X7.2453
G1 X9.3238 Z-7.1
G1 X11.5
G0 Z-5.3
F50
G1 X6.8453
G1 X9.1547 Z-7.3
G1 X11.5
G0 Z-5.3
s750
G0 G40 G18 G80 G50 G90 (thread)
G00 G53 X0 Z-183
T707M6
G00 X7.35
G00 Z5
G00 X6.35
M03 S750
M08
G76 X5.1 Z-6.2 Q2 P1.27 J0.006 L45 H0.2 I29 C1 B0.0001 T0
M9
M5
M30