Lost all my settings (my fault) so had to set it all up again from scratch.
Spent half a day trying all the usual settings and some not so usual. Raster engraving was a disaster no matter what settings I tried.
Thought there must be some electrical or mechanical problem that has suddenly appeared. Couldn't find anything.
Then I thought, just in case, I will go back to an older version of LaserCAd and firmware.
HEY PRESTO !!!!! Just like magic all the problems disappeared. All good again.
Should have thought of that earlier. Would have saved me a LOT of time and frustration.

Anyone else had any problems with it?
I am using V8 of the firmware.
Greolt