It looks like the 'edit' feature for segments is gone when you click the 'i' information button. No more 'pencil' shows up to edit. the only way I've found to edit a segment today is through the 'new' segment or through the segment manager. is this a bug or a new feature? This did happen about a year ago and took several months to fix. I hope it isn't that way again.
This indeed looks like a bug to me, on my end the pencil icon seems to have disappeared inside 'Reports' but it is very much there inside Analysis Workspace. I would flag it to engineering, thanks for reporting this! It should get fixed soon this time.
I've noticed that histograms charts in Workspace don't seem to work with calculated metrics. I've tried to drag and drop them from the left hand side menu but without success so far. Would it be possible to fix it in the future please?
Yeah histograms are currently working only with native metrics. Although this is not a bug but how the capability is designed. It could be a good feature request. I would recommend you to go to the ideas exchange and raise it - http://ideas.omniture.com