AC. Above you is Tools on the top line - between Favourites and Help.
Click on this and then Internet Options what you want in the Home Page address is:
<A HREF="http://www.pprune.org/cgibin/Ultimate.cgi" TARGET="_blank">http://www.pprune.org/cgibin/Ultimate.cgi</A>
This may solve the problem. The possible reason for the need to refresh, is that you are going to a forum rather than the main Bulletin Board FIRST, where everything is already 'refreshed'.
It's worth a try anyway.