Hello ,
First of all, Happy new year to all forum members and wisshing you all trouble free operation 
I run into small issue on my mashine and it becomes more and more anoing as it was running perfect before.
PC comunication is working only one way. I can transfer data from mashine to PC with no issues, but the other way around it do not work.
I tried to transfer back the same program I just receyved from the mashine, but the best I could get is seen on the picture below.
No changes were made to the PC or mashine constants.
Here is example of test program I use for troubleshooting transfer issues.
%PM
N9001
N1 G40
N2 G71
N3 G90
N4 G51
N5 G17 T8 M67
N6 G52
N7 S2000
N8 G54 G00 X-25.25 Y30.
N9 Z12.5 S2000
N11 G01 Z6. F93.152
N12 Y10. F372.607
N13 G03 X-22.75 I-24. J10.
N14 G01 Y30.
N15 G03 X-25.25 I-24. J30.
N16 G01 Y10.
N17 G03 X-22.75 I-24. J10.
N18 G01 Y30.
N19 G03 X-25.25 I-24. J30.
N20 G00 Z12.5
N21 Z8.5
N22 G01 Z3.125 F93.152
N23 Y10. F372.607
N24 G03 X-22.75 I-24. J10.
N25 G01 Y30.
N26 G03 X-25.25 I-24. J30.
N27 G01 Y10.
N28 G03 X-22.75 I-24. J10.
N29 G01 Y30.
N30 G03 X-25.25 I-24. J30.
N31 G00 Z12.5
N32 Z5.625
N33 G01 Z.25 F93.152
N34 Y10. F372.607
N35 G03 X-22.75 I-24. J10.
N36 G01 Y30.
N37 G03 X-25.25 I-24. J30.
N38 G01 Y10.
N39 G03 X-22.75 I-24. J10.
N40 G01 Y30.
N41 G03 X-25.25 I-24. J30.
N42 G00 Z12.5
N43 Z2.75
N44 G01 Z0 F93.152
N45 Y10. F372.607
N46 G03 X-22.75 I-24. J10.
N47 G01 Y30.
N48 G03 X-25.25 I-24. J30.
N49 G01 Y10.
N50 G03 X-22.75 I-24. J10.
N51 G01 Y30.
N52 G03 X-25.25 I-24. J30.
N53 G00 Z12.5
N54 Z35.
N55 X22.75 Y-10.
N56 Z12.5
N57 G01 Z6. F93.152
N58 Y-30. F372.607
N59 G03 X25.25 I24. J-30.
N60 G01 Y-10.
N61 G03 X22.75 I24. J-10.
N62 G01 Y-30.
N63 G03 X25.25 I24. J-30.
N64 G01 Y-10.
N65 G03 X22.75 I24. J-10.
N66 G00 Z12.5
N67 Z8.5
N68 G01 Z3.125 F93.152
N69 Y-30. F372.607
N70 G03 X25.25 I24. J-30.
N71 G01 Y-10.
N72 G03 X22.75 I24. J-10.
N73 G01 Y-30.
N74 G03 X25.25 I24. J-30.
N75 G01 Y-10.
N76 G03 X22.75 I24. J-10.
N77 G00 Z12.5
N78 Z5.625
N79 G01 Z.25 F93.152
N80 Y-30. F372.607
N81 G03 X25.25 I24. J-30.
N82 G01 Y-10.
N83 G03 X22.75 I24. J-10.
N84 G01 Y-30.
N85 G03 X25.25 I24. J-30.
N86 G01 Y-10.
N87 G03 X22.75 I24. J-10.
N88 G00 Z12.5
N89 Z2.75
N90 G01 Z0 F93.152
N91 Y-30. F372.607
N92 G03 X25.25 I24. J-30.
N93 G01 Y-10.
N94 G03 X22.75 I24. J-10.
N95 G01 Y-30.
N96 G03 X25.25 I24. J-30.
N97 G01 Y-10.
N98 G03 X22.75 I24. J-10.
N99 G00 Z12.5
N100 Z35.
N101 X-25.408 Y15.448
N102 Z13.
N103 G01 Z6. F93.152
N104 G41
N105 X-22.734 Y18.634 F279.455
N106 G03 X-22.5 Y19.2 I-23.3 J19.2
N107 G01 Y30. F372.607
N108 G03 X-25.5 I-24. J30.
N109 G01 Y10.
N110 G03 X-22.5 I-24. J10.
N111 G01 Y20.8
N112 G03 X-22.734 Y21.366 I-23.3 J20.8
N113 G40
N114 G01 X-25.408 Y24.552
N115 G00 Z13.
N116 X-25.408 Y15.448
N117 Z9.
N118 G01 Z3. F93.152
N119 G41
N120 X-22.734 Y18.634 F279.455
N121 G03 X-22.5 Y19.2 I-23.3 J19.2
N122 G01 Y30. F372.607
N123 G03 X-25.5 I-24. J30.
N124 G01 Y10.
N125 G03 X-22.5 I-24. J10.
N126 G01 Y20.8
N127 G03 X-22.734 Y21.366 I-23.3 J20.8
N128 G40
N129 G01 X-25.408 Y24.552
N130 G00 Z13.
N131 X-25.408 Y15.448
N132 Z6.
N133 G01 Z0 F93.152
N134 G41
N135 X-22.734 Y18.634 F279.455
N136 G03 X-22.5 Y19.2 I-23.3 J19.2
N137 G01 Y30. F372.607
N138 G03 X-25.5 I-24. J30.
N139 G01 Y10.
N140 G03 X-22.5 I-24. J10.
N141 G01 Y20.8
N142 G03 X-22.734 Y21.366 I-23.3 J20.8
N143 G40
N144 G01 X-25.408 Y24.552
N145 G00 Z13.
N146 Z35.
N147 X22.592 Y-24.552
N148 Z13.
N149 G01 Z6. F93.152
N150 G41
N151 X25.266 Y-21.366 F279.455
N152 G03 X25.5 Y-20.8 I24.7 J-20.8
N153 G01 Y-10. F372.607
N154 G03 X22.5 I24. J-10.
N155 G01 Y-30.
N156 G03 X25.5 I24. J-30.
N157 G01 Y-19.2
N158 G03 X25.266 Y-18.634 I24.7 J-19.2
N159 G40
N160 G01 X22.592 Y-15.448
N161 G00 Z13.
N162 X22.592 Y-24.552
N163 Z9.
N164 G01 Z3. F93.152
N165 G41
N166 X25.266 Y-21.366 F279.455
N167 G03 X25.5 Y-20.8 I24.7 J-20.8
N168 G01 Y-10. F372.607
N169 G03 X22.5 I24. J-10.
N170 G01 Y-30.
N171 G03 X25.5 I24. J-30.
N172 G01 Y-19.2
N173 G03 X25.266 Y-18.634 I24.7 J-19.2
N174 G40
N175 G01 X22.592 Y-15.448
N176 G00 Z13.
N177 X22.592 Y-24.552
N178 Z6.
N179 G01 Z0 F93.152
N180 G41
N181 X25.266 Y-21.366 F279.455
N182 G03 X25.5 Y-20.8 I24.7 J-20.8
N183 G01 Y-10. F372.607
N184 G03 X22.5 I24. J-10.
N185 G01 Y-30.
N186 G03 X25.5 I24. J-30.
N187 G01 Y-19.2
N188 G03 X25.266 Y-18.634 I24.7 J-19.2
N189 G40
N190 G01 X22.592 Y-15.448
N191 G00 Z13.
N192 Z35. M09
N193 M30