Re: Screen White-Out After Custom Code Additions in "Look&Feel/Customisation"
Not having the confidence/skill to try the first option, I opted instead for the second suggestion and removed the line {eval var=$prefs.feature_endbody_code} from templates/footer.tpl
Then I logged into the site admin panel and removed the custom code.
Finally I restored the line {eval var=$prefs.feature_endbody_code} to templates/footer.tpl
Now the site is working fine.
I should say I am extremely grateful for your suggestion. As a fairly new user, making this change has given me confidence to use Tiki at a deeper level.