I would upgrade to OpenCATS and get the benefit of a more current version of PHP, except I have so many customizations that I would regret loosing (already submitted to Russ, to be included in future releases of OpenCATS).
Interventions so far:
I have loaded OpenCATS beside my CATS, and now, if I open up OpenCATS first, its loads something to the browser that allows me to, then go back, open up CATS, and its visible.
See for yourself:
http://188.8.131.52/cats/index.php?m=home (CATS - open this first - should be a white screen)
http://184.108.40.206/opencats/index.php?m=home (OpenCATS - you will see the logon page as per normal... now go back to the old CATS and you can see the login)
Has anyone had this issue? Is there a setting, or a tweak that I can add to an older release of CATS to make it visible again?