There must be problems with the script, the director dropped out, Leonador Dicaprio dropped out and now Christian Bale. Obviously it's a problem with the movie itself and not with the actors or directors.
When you see a mass feeling from a movie in the late stages of pre-production, in most cases, one of the following happened.
1) The script sucks, blame the writer
2) Investors pulled out, blame the producer
3) Celebrity scandal damaging the PR of the movie, blame an actor
4) The production budget came in too high, blame the unions
5) Visual effects expectations were way out of expectation, blame the SFX house
6) Major news event occurs making the movie publicly unacceptable, blame the media
In this case, my guess it is a mix of #1 and #2.
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I'm lobbying for Jay and Silent Bob as Steve and Woz.
Doing the Apple / Jobs story as a druggie comedy instead of a drama would work. Have them finish up the Apple One prototype for the Homebrew Computer Club, they blaze, get the munchies, pick up a dozen Apples at a supermarket, drive stoned ...
"Man what do we call this company?"
<chomps apple> "Hmm .... let's call it 'Apple' dude. You like apples?"
"Yeah, but is that a computer name?"
"Man, like it is now."
Think Cheech & Chong as engineers.