The Calendar is back to where when an event is added after 1:00pm the date and time do not auto populate. I am using version 1269. I also checked this on both IE and Firefox and it acts the same regardless of which browser is used.
Also, when on the week view if you right click on any day/time for any date that is viewable a selection of "Add Event" is visible but it does not do anything in Firefox. I was able to get it to work on IE so it does appear to be related to the browser.