It does seem to be a rather janky update. Like I mentioned on Alex's FB, maybe some of the problem has to do with the 60 second local and the IS is having a difficult time trying to handle everything that it needs to do in such a short amount of time (loading the screen, estimating the narration time on text based before it decides if it has time to show the next text screen and/or daypart, or if it should just skip directly to the ext. forecast.)
It's just a thought.. I don't really know much about the intellistar's system build, but the IS is now over 10 years old isn't it?