OK - I've got this website - [url removed, login to view] - it had just been developed and I had all of it working as I wanted it. I then had a last few little tinkerings and hey presto - I've got the white blank screen when you select any option from the main screen. Previously there were a few articles on display or a few sections blog style from the menu selection.
The last few tinkerings that I remember were to do with:
1) the htaccess file. I put in some code that meant that the menu bar held the website name even though all of the screen was infact in the joomla directory. I've since deleted the .htaccess file but still have the error.
2) I also noticed that the HOME on breadcrumbs was now wrong and put me back to the joomla directory which was invalid so I changed the breadcrumbs module
3) That didn't work so I changed the config file -
Only after all these three did I notice the problem with the blank screen so can't say what caused it - if any or a combination of these three actions.
I've enabled debugging but the output means little to me.
This is not a large project, there's no great rush so please work around other work you have.