ah thanks, I toggled continuous view and behaving correctly now.
( there may be user error involved, though I do experience a bit of "wonkiness" with mousewheel zoom in the NE. Seems to zoom out fine but, I usually can't zoom back in to the same depth and have to use the scroll bar +- to get back zoomed in right. Though haven't really dug around to confirm, so will not derail, but might post about that at some point if I figure it out for sure)
edit: I think I know what it is, mousewheel is scrolling the view at the same time cmd+mousewheel is zooming
edit 2 - actually there this jumping too. I don't want to derail, but here is a small vid, if it looks wonky perfect, if not....continue on..... (all zooming in vid is with cmd+mouswheel unless you see the scrollbar zoom being tweaked)
zoom jumping:
https://drive.google.com/open?id=1Bj...uIWnzPruxAwv_s