Mx Compound Arc between 2 Strings produces erratic results

Mx v8i ss2. 

Dear colleagues, 

Dutch design rules usually don't request compound arcs in intersections, so this is a first for me. And an unsuccesfull one, as I get erratic results. So I tried one with minimal interference: empty model, two two-point intersecting strings with levels, compound arc using the Jason Walsh video I found here

It still won't work: 

The weird thing is between the end of the R=40 arc and the dynamic report's placemark's point, no intermediate points exist (the line is curve fitted in between). 

Any ideas? 

Included: Mx Output Window, a bit garbled as copy paste removes double spaces: 

DESIGN TMP
W147 Curve fitting invoked
017 0.01
W120 System values have been modified
VALUES ADOPTED :
SEARCH TOLERANCE 0.0010
LEFT OFFSETS -100.0000
RIGHT OFFSETS 100.0000
SECONDARY TOLERANCE 20.0000
SECONDARY OFFSET 20.0000
CHORD TO ARC TOLERANCE 0.01000
REFERENCE ANGLE 0.00000
CURVE FITTING INVOKED
STANDARD CONTENTS 7700
STATIONS STRING PSSA
NO DATA CHECK ON NON-STANDARD DATA
ANGLE DEFINITION:
INPUT: GRAD OUTPUT: GRAD
COORDINATE DEFINITION:
INPUT: XY OUTPUT: XY
VERTICAL OFFSETS APPLIED
FLAT TRIANGLES PERMITTED
NO TRIANGULATION REPORT
STANDARD DESIGN RULES APPLIED.
146J001J000MZZZ 20. 1. 1. 1.
147 40. 15.75 60. 20.25


ADJACENT STRING DETAILS---------------------------------------------------------

NAME PNT -----X---- ------Y---- ---Z--- ----C---- --WCB-GRAD-- --RADIUS- %SLOPE

J001 2 143502.980 486166.054 3.000 446.169 200.34157 INFINITY 0.000
J000 1 143481.750 486188.163 1.000 510.220 98.20274 INFINITY 0.000
ELEMENT SUMMARY-----------------------------------------------------------------

-CHAINAGE -------X----- -------Y----- -WCB-GRAD-- --RADIUS-- --LENGTH--

START 0.000 143502.37068 486166.05755 200.34157
END 93.576 143481.80642 486186.15688 98.20274
CENTRE 143482.37097 486166.16485 20.000 93.576



ADJACENT STRING DETAILS---------------------------------------------------------

NAME PNT -----X---- ------Y---- ---Z--- ----C---- --WCB-GRAD-- --RADIUS- %SLOPE

J001 2 143503.006 486170.952 3.000 441.272 200.34157 INFINITY 0.000
MC02 68 143463.006 486171.167 1.372 67.780 16.09157 20.00 -2.578
ELEMENT SUMMARY-----------------------------------------------------------------

-CHAINAGE -------X----- -------Y----- -WCB-GRAD-- --RADIUS-- --LENGTH--

START 0.000 143503.00590 486170.95190 200.34157
END 148.281 143429.34764 486192.77860 36.33802
CENTRE 143463.00648 486171.16651 40.000 148.281

W766 String J001 has had 1
extra points generated


ADJACENT STRING DETAILS---------------------------------------------------------

NAME PNT -----X---- ------Y---- ---Z--- ----C---- --WCB-GRAD-- --RADIUS- %SLOPE

MC02 25 143489.160 486147.352 2.663 24.382 277.95274 20.00 -2.478
J000 1 143494.255 486188.516 1.000 522.730 98.20274 INFINITY 0.000
ELEMENT SUMMARY-----------------------------------------------------------------

-CHAINAGE -------X----- -------Y----- -WCB-GRAD-- --RADIUS-- --LENGTH--

START 0.000 143475.58224 486184.97743 77.95274
END 19.085 143494.25477 486188.51578 98.20274
CENTRE 143495.94842 486128.53969 60.000 19.085

W766 String J000 has had 1
extra points generated

END OF MINOR OPTION 146/147 ----------------------------------------------------

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