The knives were out in Hollywood for GI Joe: Retaliation back in 2012, when Paramount surprised everyone (including director Jon Chu) by announcing it was putting back the release by nine months from 29 June 2012 to the end of March 2013.
At the time there was the usual Hollywood smokescreen to placate the masses. The official line was that the studio needed more time on the 3D conversion, whereas in fact executives were scrambling to reshoot and expand Channing Tatum's role. Tatum's chemistry with Dwayne Johnson is one of the best things about this actually quite decent sequel to a hideous predecessor (2009's GI Joe: The Rise of Cobra) and test audiences last year were upset when Tatu's character died in the opening minutes.
That's understandable. Tatum