I just updated to version 4.6 today. I did some UMG work in version 4.5 and converted my project to 4.6. version.
First it had so errors without me even doing anything. First error was I had a remove from viewpoint node hooked up, it said to use remove from parent node instead. I did that and first went away.
Second error said my function was not pure. I deleted function and made another one, that error went away.
Question on those. Is that because of new version 4.6.
After I fixed these errors 4.6. crashed on me three different times.
I was in top down orthographic view attempted to click icon in upper right of screen to return to prospective view, then it crashed.
I would be happy to provide my crash logs on this, but I do not remember where they are located for Mac.