Site still has issues after update

[Marwin]

Originally Posted by Teazle

At risk of saying something blindingly stupid in this thread, after the switch I restarted my computer and everything worked fine again.

That might work in some cases. However, many name servers cache (save) the IP address so they don't have to make a new lookup for every request and that forces you to wait until the data is refreshed in the name server cache with the new IP (which can take up to 24 hours if you're unlucky).