Hey usb777,
I have been pulling my hair out with this new update with my own scenery New Zealand Flora (found here: http://www.aotearoa-creations.com) it uses custom shapefiles and biome files to represent New Zealand in its entirety.
However, this new update has broken the scenery where it would at least load before the latest update, now it hangs at the loading screen to infinity and the gpu shoots to 100%, never did this before at runtime.
Even after trying to re-engineer the issue through non-stop hours of effort I have had no luck but am 99.999% confident Microsoft have screwed something up with the project editor although at the time of this writing I cannot access the new SDK to recompile my project.
I couldn't even run a project I built with the sim project editor and that's at the source so I would hold tight, as with all us developers, we are equally frustrated by the unknown extent of te problem.
I will be making an ongoing effort to get the answers I need for my product and once I have more info that could be useful to all, I will share those.
Waiting for the latest sdk to test with.
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