Seems 1.9 have some new bugs. One of them is a glitch on hiding object/layer where it seems to affect multiple object/layer that's not selected even on different artboard. Here's a sample vid of the bug
There are lots of weird stuff as well like mask within a group in symbol sometimes jumps across the artboard when the symbol is inserted to other artboard or one of the object inside it is moved (I tried to replicate it in this video at 0:18 mark but it's not happening, so just ignore this part)
I'm gonna jump out of this 1.9 ship and go back to 1.8, hopefully other people can post proof of the other bug. I have some deadlines and not gonna deal with this bug.
Also my system is Lenovo Y700-15isk, Win 10, Intel i7 6700HQ, GTX 970M, 16GB RAM. Update from latest 1.8.5 to 1.9 (not clean install).
Thanks lads
Bug.avi