I have now uninstalled and reinstalled LR6 several times now.
If it does import images in Develop mode it makes it's own settings and does not sync my settings.
Blacks are -21 Contrast +16 Whites +6 etc etc
It drives me nuts!!!!!
What is the solution cos I aint hanging around long more!
Thanks in advance,
Would suggest you to update Lightroom 6 : Keeping Lightroom Up-to-Date
And for sync settings, select a group of fresh images (unedited) > choose sync settings> edit them and check if it works well.