I'm going to take a stab at this. I'm also trying to get my 4th axis running.
By not knowing exactly what you are trying to accomplish with your program,
I unchecked the ROT ROLLOVER in the general configuration. Now your
program will run to the end and stop.
It appears your making some sort of groove.
Just to see what it was doing I clicked on SINLE BLK button and it stepped the
2.053 as each line was read.
I may be way out in left feel, but I took as stab, just trying to learn.
I'm sure someone with more knowledge will chime in.
olf20