I upgraded from 5.8 to 5.9, but 5.9 does not prime print core 1 before starting to print, hence prints fail as material is not extruding properly at the start of the print.
I reverted back to V5.8 and the print core 1 prime works Ok and print is a success.
Is anyone else experiencing the same issue with V5.9.
Note if you let the print proceed the first part associated with print core 1 is missing but the material will start to extrude part way through and hence is OK until the next pass over the initial missing print portion and from there on the print is a mess.