Registered just for that issue.
Tried steam download AND appstore download. Tried the lowest graphic settings and altered difficulties.
Both installations - same problem:
After walking down the eerie path of memory in the in-between and being sucked in by the adra, game is not responding (black screen, beachball).
System:
MacBook Pro (Retina, 15', mid 2014)
2,2 GHz i7
16 GB 1600 MHz DDR3 RAM
Intel Iris Pro 1536 MB
I hope Obsidian fixes this as soon as possible for I am very eager to start playing.