I just loaded 2018. Looks pretty good and I like the new section fills so far.
But, I am having a problem with lines in a SU model loaded into LO that appear in raster mode do not show up in vector or hybrid mode. I am not sure this is an 18 problem, but it is new for me and disturbing. Not all of the lines drop out, but just some. It does not appear to be related to the section fills. I have tried resaving and reloading the model with and without the section fill turned on.
this file is a jpg showing the page from LO