I used these settings on the scales image you supplied in ‘sakura and branch.lbrn2’
Gamma on image 0.5
Speed 200
Max Power 20
Min Power 9 (my 80W tube starts to fire at 8.8%)
DPI 300
The preview looks like this:
And output on ply:
If you are looking for results that you previously got that corresponded with the presence of traversal lines across the image in the preview, then either A) you were using a different ‘Image Mode’ (and just not realising it), or B) you were using grayscale and had ‘Bi-directional scanning’ turned off, which would also leave traversal lines across the engraving in the preview.
If we assume B), then you will still need to revisit your settings. Try adjusting them to be similar to what I have used here as a starting point, and let us know how you get on.