I have
ARTIO JoomSEF v2.3.0 (paid)

everything has been fine - HOWEVER today out of NO WHERE the pages are blank

If I turn off SEF in Global config - site functions

I have reuploaded a copy of the old .htaccess - when I turn on the SEF in Global - blank white page again

what could have caused this?

what needs to be done to resolve blank white pages?

I have managed to narrow it down to something in the components/com_sef folder

If I rename that folder - with SEF on in globals - there is no white page - but URL are as if the SEF was OFF

I have also disabled/renamed the administator/components/com_sef folder - and now the Core Joomla SEF functions

I removed and completely re-installed the Artio System and now it works

What would cause this random issue - I have no clue

there must be BUGS in this component - use caution when purchasing