I don't know how else to say it: this useful feature is not longer
usable.
I'm a new member here but I've been working with this theme for awhile.
3.5.1 not only screws up or does not display older adder widgets, it
also does not, in my work with it, sufficiently or reliably support
adding of new ones.
Just a fact. I may have to go back to an earlier version to get my
widgets back.