It depends on what version of mocha you’re in, are you in the standalone, the plugin, or the free version that comes with AE? You should just be able to reload the footage in the latest versions of mocha and you can adjust project settings. Try that and let us know.
Cheers,
Mary
In fact I didn’t know that the resolution of a project (and all its components) were automatically updated by Mocha with a simple relink with absolutely nothing else to do !
I thought I had to manually change parameters of resolution and so many things…