So, I installed the latest patch. And by going through the advice given, I identified the following plugins as the ones causing fatal errors:
yalist
anchor
creole
refnotes
mediasyntax
exttab2
diagram
bbcode
alignment
It's going to be easier for me to revert to the older version of dokuwiki. Is it as simple as installing the older edition on top of the newer one?
I did see the advice on how to do the path myself on each file, but the instructions weren't something I felt competent to attempt (ie I couldn't follow what I was supposed to do).