This is a new failure again 
, it is trying to make a network connection to github to get the updates, so checking that networking is OK would be a good bet, trying to access githun.com via the web browser to make sure you can get there for instance. If it doesn't hang (just doesn't update) you might try clicking Help->Check for updates in Fritzing as sometimes I've seen the automatic updates request not work (i.e. there are updates available, but they don't download til a manual check for updates.)
Peter