Website Sign in page stopped loading

Hi,

I appreciate this is a rather vague opening title but I have been using WebAssist plugins for nearly 20 years, and today I am stumped.

I can access my website homepage and about page etc. without issue but then when I go to the 'sign in' page, the page is completely blank! No code has been changed recently, and the only change has been to install a fresh SSL certificate which my hosting provider says is unrelated and is working fine. However, they have pointed me to an error log for the page which is showing the following:

– PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; WA_AB_WhereClause has a deprecated constructor in /home/os3hgh20nl81/public_html/ourbigdayonfilm/WA_DataAssist/WA_AppBuilder_PHP.php on line 166 –

I am not sure if even this is causing the issue but it is obviously related to the DataAssist plugin.

In the past, Ray has always been my go to for support, enjoying many interactions with him here and also over the phone over many years. I have been absolutely heartbroken by his passing and now don't know who else to turn to...

Is anyone available to offer any help or advice?

Your help will be much appreciated.

Kind regards,
Thomas


====== UPDATE ======

I have spent the day trying to figure out what is going wrong. So far, I can figure out that by removing the "Remember me" and the "Log me in automatically" fields, then the page will load. However, the sign in feature will still not work. I have also generated a new login page locally and tested it, and this instead returns as 'incorrect username and password'. Bizarrely, my existing sign in page works locally. I'm still completely lost :-(