Well, I'm still not at the daw, but I remember you need to select one option from the right-click menu before seeing the Recompute command. Also, maybe selecting multiple audio clips and running Recompute redraws waveforms of all the selected clips?
Anyway, if it's not the feature the OP is looking for, then I don't know what he's after. I wish he had added this "another X2 productivity setback" part to the thread title AFTER making sure the feature doesn't indeed exist in X2, because Sonar haters from other daw forums might see it and keep advertising Sonar is a BAD daw.
@OP:
Next time, prepare two versions of posts. Make the first one VERY rude and let off steam, and then make the second one polite and post the latter only ; )