Was working OK. Now cannot login
I've had a hunt around the forum but haven't found a similar issue.
I am running Vanilla 3.3 on a shared server that was installed using Installatron (perfect for me as it's a one click install). It's been working fine for about a year now. It is installed in a sub folder of the main website. It is set to auto-update on minor updates but as far as I can tell there haven't been any. Server is running PHP version: 7.3.6
Today I cannot login using the credentials stored on my system. It accepts the user/password details but doesn't log me in. The three little squares blip a few times then the page reloads with username/password empty. It does not present any error message either.
I 've tried clicking the forgot password link and I get a reset email OK. I click on the Change Password button and it takes me to the reset page. I enter a new password and click save. Enter login details and new password and it doesn't log me in.
I have also put a similar query on my ISP as I do not have a clear idea which side of the fence the problem lies.
Any thoughts would be appreciated.