Grrr, CoursePress removed all my courses when I tried to preview one

I hit preview; had a time out; after a couple of minutes I did see a page (made me happy at first) - then I realised CoursePress had wiped away all units. A moment later I found out CoursePress had also wiped out all Layers WP pages I had created (I guess these were custom post types too).
I switched to Layers WP because CoursePress before crashed on its own CoursePress theme ...
Next step will be to fire up the automatic backup. ... Unhappy ...