after you run the script, you'll need to close and reopen the font for the change to take effect. (I've just tested it again in RF3, works fine)
another solution would be not working directly on a server or DropBox folder, if possible. you could ‘check out’ the font to another place, edit, and then check it back into the server. (or use a version control system like Git, which works just like that; see this tutorial in the new docs.)
So after running ufonormalizer on the files things seem to work. It takes a really long time to compile (about 10 minutes, though that drops to about 1 or 2 minutes if I turn off autohinting), but it does work. I'm not sure what ufonormalizer actually changed (it looks the same to me) but nothing crashes and there is a working OTF at the end of the process.
thanks and sorry!
my post was missing all the info.
it happened yesterday for the first time. robofont crashed when i wanted to save a ufo.
at the moment of the crash there also was a script open in the drawbot extension.
and when I reopened robofont it also opened the script but in the robofont editor.
guess that caused the confusion.