See https://gist.github.com/aspiers/7330084c7bd99d2003e2 for the previous one related to ido-ubiquitous.
After deinstalling ido-ubiquitous, forward-word still fails! How to debug this?!
Debugger entered--Lisp error: (void-function nil)
nil(144 192)
forward-word(1)
call-interactively(forward-word nil nil)
command-execute(forward-word)
UPDATE: I inserted a canary invoking forward-word after each package got loaded. This immediately revealed js2-mode to be the culprit! Now investigating ...