[=SamOnline;480510]
Since the last preview (6) every time I try to save any blueprint the editor 
I get crashes saving, when the editor auto-saves, compiling, playing in-editor, and just generally doing about anything at all.
I think it’s sort of part and parcel to using a preview release, report it on AnswerHub is about all you can do.
Meanwhile, do like I do, and save after everything. Connect a pin? Ctrl+S. Delete a node? Ctrl+S. Need to compile? Ctrl+S, then compile, then Ctrl+S again after it works.
It becomes second-nature.