Update
I somehow had the wrong php version. After changing this its back working again
Hello
I have been using phplilsts for about 5 years now.
I have not logged into phplists admin for about 8 months. I tried to log in today and just get a blank screen.
Any ideas why this might be or what I can do to resolve it.
I could reinstall on older archived directory or upgrade to the new version.
Regards
Oz
Further to the above I have found out the following:-
I am on phplists version 3.4.0 using PHP 5.6 whiich works fine.
I get the blank screen after loggin in if I upgrade my php version to 7.3.
Is there something I need to do to get 7.3 to work?
Thanks in advance
Osie
Upgrade your version of phpList. 
Thanks for the reply. I thought that might be the answer but wanted to wait for a quiet time to do it towards the end of the year.