Both regular projects and spidermonkey project saves result in a crash. On every file I've tested it with, multiple containers and streams. It seems to be universal. It can load spider monkey project files saved from an older version without issue. It errors on loading older avidemux project files, however. It says it "can't find a demuxer for" the file. However, it does not crash on this error, it just can't process the project file.
Regular projects and spidermonkey projects can be saved and loaded in 8027. I don't know exactly when this problem crept up, but it was after 8027.